• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
United States
Castle Mountain Phase 2 Expansion Project (Castle Mountain)

This page is not tailored to
devices with screen width under 750 px.
 Location:
100 km S from Las Vegas, California, United States

  Project Contacts:
Suite 1501, 700 West Pender St.
Vancouver
British Columbia, Canada
V6C 1G8
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in United States
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Carbon re-activation kiln
  • Filter press plant
  • Smelting
  • Centrifugal concentrator
  • Intensive Cyanidation Reactor (ICR)
  • Gravity separation
  • Hydrochloric acid (reagent)
  • Dewatering
  • ROM/dump leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life14 years (as of Jan 1, 2021)
The Castle Mountain Project is being developed in two stages, Phase 1, and Phase 2. The Phase 1 project, completed in 2020 and currently operating, consists of a double-lined run of mine (ROM) heap leach facility to treat 14,000 short tons of ore per day (ton/d). The Phase 2 project will consist of the expansion that is described within this project.

The Company expects to submit Phase 2 permit applications in Q1 2022.


Owners

Source: p. 28
CompanyInterestOwnership
Equinox Gold  Corp. 100 % Indirect
Equinox, through its indirect wholly owned subsidiary NewCastle Gold Ltd., has 100% of the right, title, and beneficial interest in and to Castle Mountain Venture which owns the Castle Mountain Mine.

Deposit Type

  • Epithermal
  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

Castle Mountain is classified as a low-sulfidation epithermal gold deposit (Scott et al., 2018), a sub-type of the epithermal class of gold and silver deposits (Sillitoe and Hedenquist, 2003). Epithermal gold-silver systems are driven by magmatic activity and form high-level vein, stockwork, disseminated and/or replacement deposits that may be mined by open-pit and/or underground methods. Some deposits also contain substantial resources of Ag, Pb, Zn, Cu and/or Hg.

Structure and associated rock porosity-permeability characteristics are the first-order control on the distribution of gold. Flow-dome breccia margins, phreatic diatremes, fault cataclasite and fractures focused provided conduits for hydrothermal fluids and contain the highest gold grades. Unfractured coherent flow-dome facies, clay altered volcaniclastic facies, and clay altered phreatomagmatic diatremes with low or variable permeability are weakly mineralized due to lower fluid interaction. Lower permeability units that are mineralized have been cut by structures such faults, fractures, or phreatic diatremes that promoted hydrothermal fluid interactions.

Gold is focused along structures and margins of facies contacts. It is believed that sub-vertical structures acted as pathways for magma and are responsible for the emplacement of the felsic volcanic package. These same structures also acted as conduits for gold-bearing hydrothermal fluids. Intersections of the steep structures with more permeable volcanic rocks created an environment for enhanced gold precipitation from hydrothermal fluids, possibly due to processes of boiling and interaction with meteoric water.

Lithologic controls are dependent on the host rock texture. Tuff beds, auto-breccias, and hydrothermal breccias have permeable fragmental textures. Brittle rhyolite flows and intrusive equivalent rocks exhibit intense fracturing and are characterized by cooling joints, vesicular zones, spherulitic vugs, and flow foliations. Gold occurs within secondary silica in all these features. Major fault and fracture systems and intersections of fracture systems provided structural controls for mineralization. In the deposit area, north-northeast-striking, mineralized fracture zones are exposed in outcrop.

The morphology of mineralization follows two patterns. Firstly, gold is enriched along steep to vertical brecciated contacts of flow-domes and phreatomagmatic diatremes. Secondly, gold occurs in broad tabular zones that correlates with the general orientation bedding. The lateral extent of the mineralized bodies centered around fault zones are dictated by the intensity and extent of fracturing and faulting, in addition to the paleo-porosity of the host rocks.

Some faults and fracture zones are not gold-bearing since the structural regimes through the Project were active both pre- and post-mineralization. Gold seems to have precipitated during a single phase within a larger and longer-lived structural and hydrothermal event.

Silicification is commonly associated with gold occurring as pervasive silica flooding and quartz veining. Quartz veins can be vitric and “gel-like” or opaque white-gray opal. Vitric quartz veins typically occur in clusters as sheeted veins or stockwork in zones ranging from 3 to 35 ft (1 to 10 m) wide. Amorphous quartz occurs as discontinuous irregular veins and as open space filling quartz. The strongest silica alteration associated with gold is found along brecciated coherent rhyolite margins; this results in mosaic breccias where angular rhyolite clasts are within a hydrothermal-related silica matrix.

Gold on the Project occurs in oxidized fractures, faults, discontinuous veins, and breccia matrix. Gold mineralization correlates best with the deep red, red-brown and brown iron oxide that can range in color from pink to red-brown. The iron oxide intensity and appearance are commonly controlled by the volcanic facies occurring as discontinuous, fracture-controlled textures in coherent rhyolite facies, as matrix replacement in rhyolite breccias, wispy selvages and clast haloes in volcaniclastic rocks, and pervasive or matrix selective in diatremes. These iron oxide textures can be cut by fracture and vein filling iron oxide that ranges in color from brown-tan to red.

Visible gold is rarely observed in hand specimen and core. In petrographic samples collected near JSLA, visible gold is associated with iron oxide and silica and proximal to illite and adularia alteration (Cline, 2016). Gold deportment studies from Oro Belle by Chudy and Lane (2020) indicate that mineralization is roughly 79% native gold, 17% electrum and 4% silver minerals by frequency of grain count. Quartz may be intergrown with iron oxides/hydroxides, most commonly as hematite, which have formed as oxidation products of former sulfide minerals. There is a low abundance of sulfides observed on the Project. The most common sulfide mineral is pyrite, and varies from nil to 1%, which occurs within clasts and matrix.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining will be an open pit operation using conventional diesel-powered truck and shovel mining equipment. The current Phase 1 operation consists of a 14,000 ton/d (12,700 t/d) ROM operation with a focus on mining backfilled material that was placed in the JSLA pit from the previous mining operation 20 years ago. The Phase 2 expansion will increase production to 53,500 ton/d and extract hard rock material from open pits which will be drilled, blasted, and loaded to mine trucks using hydraulic shovels and wheel loaders. Phase 2 mine production is split with 50,000 ton/d (45,400 t/d) to the heap leach and 3,500 ton/d (3,200 t/d) to the mill.

The Phase 2 mine plan includes 14 years of operation expanding the overall life of mine (LOM) to 19 years and delivering 266.6 Mton (241.9 Mt) of ROM heap leach ore with an average diluted grade of 0.012 oz/ton (0.40 g/t) gold to the leaching operation. The mill will commence operation one year later and will process 17.7 Mton (16.1 Mt) of ore with an average diluted grade of 0.067 oz/ton (2.28 g/t) gold. In some years, a small portion of ROM ore will be crushed and re-directed to the mill when availability permits.

Phase 2 mining depends on several things including permits and is expected to commence two years prior to full production. The expanded heap leach and mill are anticipated to reach full production by the start of Year 6, designated as Year 1 for Phase 2.

The mine plan will depend on several activities including permitting and incorporates the following assumptions:
• Phase 1 – initiated in month 1 with contractor mining of backfilled ROM ore from the JSLA open pit to Phase 1 leach pad.
• Phase 2 – initiated in month 36 with JSLA pioneering and access road construction to commence using contractors in month 37. Contractor to develop JSLA East pit to 4,540 ft elevation.
• Staggered mining equipment deliveries month 42 to month 48. Mining rate begins to ramp up as equipment is delivered.
• Ramp up overall mining rate to 73 Mton/y (66 Mt/y) through to Year 9 then expand gradually to 80 Mton/y (73 Mt/y) through to Year 16 after which production begins to drop through Year 19.
• Overall sequence of development in the JSLA, Jumbo, Oro Belle and East Ridge area is clockwise development to final to pit limits in each area to allow for an orderly sequence of backfilling waste as pits are completed.
• Sequence at South Domes is an initial southwest pit with an expansion to the northeast.
• The resource block model was developed on 20 ft (6 m) benches. The mine design was developed using the 20 ft bench height with triple benching to 60 ft (18 m) between design catch benches or berms. Operations are planned for a 30 ft bench height. Sinking rates in the schedule were limited to 300 ft/y or the equivalent of 10 benches/year. Drills, loading units and support equipment appropriate for mining a 30 ft (9 m) bench height have been selected for the mine plan and associated cost estimates.

The open pit mine development plan consists of nine pit development phases expanding to two large open pits. A waste dump will be located along the east property boundary and a second dump will be expanded to the northwest property boundary. A high-grade mill feed stockpile will be located adjacent to the mill primary crusher.

The mine will operate as a conventional diesel-powered truck shovel operation. The typical production cycle will be drilling, blasting, grade control, loading and hauling. Primary loading units will be hydraulic shovels and wheel loaders with support equipment providing development access, road maintenance and equipment servicing capability.

The Phase 1 mine plan continues with contractor mining of JSLA open pit backfill material that is economic to process by ROM leaching. It is proposed to initiate hard rock mining of the JSLA East Pit with contractors in month 37 of the plan. Mining continues in the JSLA Backfill Pit which is completed to bench 4140 during Year 5.

During Years 6 to 8, JSLA East Pit is mined to 3860 bench. In Year, 6 full production is reached for ROM ore production at 50,000 ton/d. JSLA West Pit developed to 3980 bench. Jumbo Pit pioneering commences in Year 8 and by Year 8 has reached 4520 bench. Oro Belle and East Ridge Pits are pioneered as well in Year 8 to the 4800 Bench.

The JSLA Pit is completed in Year 12. Oro Belle Pit reaches 4260 bench in Year 12. East Ridge Phase 6 Pit is completed in Year 12 and East Ridge Phase 7 Pit is down to 4360. The South Domes Phase 1 Pit is pioneered in Year 10 and 11 and by Year 12 is down to 4180 bench. The average annual mining rate during this time is 73.2 Mton. The Northwest and Southeast dumps are filled to capacity during this time interval and backfilling commences in JSLA Pit.

The Oro Belle Pit is completed in Year 15 and East Ridge Phase 7 Pit is completed in Year 16. Pioneering of South Domes Phase 2 commences in Year 15 and by the end of the year Phase 1 is down to 4060 and Phase 2 is down to 3620. Waste backfilling continues in the JSLA and Jumbo Pits.

South Domes Phase 1 is completed during the first half of Year 19 and South Domes Phase 2 is completed later in the year. Overall mining rates may become limited by sinking rate limits of 300 ft/y in Year 18 and Year 19.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 49" x 37" 175 HP 1
Cone crusher 60" 500 HP 1
Ball mill 16.5' x 21' 3300 HP 1

Summary:

Crushing
ROM ore will be dumped onto stockpiles and a front-end loader (FEL) will be used to reclaim ore via a static grizzly with 24 inch openings. Ore will flow into a 20 yd3 dump pocket, while any boulders will be removed for later reduction using a backhoe with a rock breaker attachment. An apron feeder will draw ore from the dump pocket and discharge onto a vibrating grizzly feeder. The vibrating grizzly oversize ore will feed directly into the 49 in x 37 in jaw crusher with an installed power of 175 hp. The minus 4 inch ore will bypass the crusher and feed directly onto the coarse ore transfer conveyor. The primary crushing stage will produce a product P80 of approximately 4 in with a closed side setting (CSS) of 4 in. A magnet will be installed over the coarse ore transfer conveyor to ensure any tramp metal is removed ahead of fine crushing.

Jaw crusher discharge will be combined with the vibrating grizzly undersize on the coarse ore transfer conveyor and will feed an 8 ft x 20 ft double deck inclined screen. The top deck of the secondary screen will have an aperture size of 1 inch and the bottom deck will have an aperture size of ½ in. The plus 1 inch material from the top deck and the plus ½ inch ore from the bottom deck will be conveyed to a surge bin ahead of the secondary cone crusher. The undersize from the bottom deck, minus ½ inch ore, will be the final product that will discharge onto the screen undersize transfer conveyor and ultimately report to fine ore bin via the final crushing product conveyor.

A belt feeder will withdraw ore from the bottom of the surge bin and feed it into a standard cone crusher with an installed power of 500 hp. The secondary crusher will operate in closed circuit and will reduce the ore to produce a product P80 of approximately 0.8 in. Crushed product will be combined with crushed material from the primary crushing stage on the coarse ore transfer conveyor and return to the secondary screen. Between the screen undersize transfer conveyor and the final crushing product conveyor, a diverter gate will be installed to allow for recovery of crushed product material should the bin be temporarily unavailable.

The primary crushing facility will utilize a 24 ft high mechanically stabilized earth retaining structure to build up elevation to allow for proper vertical clearance between equipment within this facility. The retaining wall is backfilled with select structural backfill material while further extension of the pad is achieved using mine waste from Phase 2 mine pre-development activities.

The crushing plant product will be conveyed to a fine ore bin. Two draw points under the bin will provide ore to two reclaim belt feeders located underneath the bin. The reclaim feeders will discharge onto the ball mill feed conveyor.

Grinding
Reclaimed ore from the fine ore stockpile will feed a 16.5 ft x 21 ft long overflow ball mill via the ball mill feed conveyor. The mill will be supplied with rubber liners, a single 3,300 hp wound rotor induction motor with a VFD, a trommel screen, and a retractable feed spout/chute. Pebble lime will be slaked, and milk of lime will be added to the ball mill feed for pH control. An automated feeder will supply grinding media to the ball mill. Ground slurry will overflow from the ball mill onto the trommel screen attached to the discharge end of the mill. The trommel screen oversize will discharge into a trash bin for removal from the system, while the undersize will flow into the cyclone feed pump box.

Slurry from the cyclone feed pump box will be pumped to a cluster of four (2 operating/2 standby) 12 inch cyclones for size classification. Process water will be added to the ball mill feed and the cyclone feed sump to achieve the appropriate pulp density. The coarse cyclone underflow from one operating cyclone will flow by gravity back to the ball mill for additional grinding while the underflow from the second operating cyclone will flow by gravity to the gravity circuit. The fine cyclone overflow, at a final target product P80 of 100 mesh (150 µm), will flow by gravity to a vibrating trash screen ahead of the pre-leach thickener.


Processing

  • Carbon re-activation kiln
  • Filter press plant
  • Smelting
  • Centrifugal concentrator
  • Intensive Cyanidation Reactor (ICR)
  • Gravity separation
  • Hydrochloric acid (reagent)
  • Dewatering
  • ROM/dump leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in column (CIC)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

For Phase 2, the heap leach pad will be designed to process 18.2 Mton (16.5 Mt) annually at an average life of mine grade of 0.012 oz/ton (0.41 g/t), while the mill will be designed to process 1.3 Mton (1.2 Mt) annually at an average LOM grade of 0.068 oz/ton (2.32 g/t). When considering both Phase 1 and Phase 2, operations will extend to approximately 19 years with an additional estimated three years of heap rinsing as part of reclamation where gold will continue to be leached and recovered.

Heap leaching
ROM ore will be delivered to the leach pad by the mining fleet. Pebble Quicklime (CaO) will be added for pH control of the process from two 100 ton silos. The lime will be metered into a clamshell and dumped into the loaded trucks which will then deliver the ore to the active stacking area.

Phase 2 design considered both use of a single pad to be adjoined with the current Phase 1 pad as well as construction of a separate pad. Both options would use a soluti ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 80.5
Gold Head Grade, oz/ton 0.016

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal koz 3,187
Gold Metal in doré koz 2223,203

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing rate  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Mineral Reserves and Resources are reported using a cut-off grade of 0.17 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Proven 84,910 kt Gold 0.55 g/t 1,498 koz
Probable 172,990 kt Gold 0.48 g/t 2,670 koz
Proven & Probable 257,900 kt Gold 0.51 g/t 4,168 koz
Measured 781 kt Gold 0.68 g/t 17 koz
Indicated 73,452 kt Gold 0.62 g/t 1,453 koz
Measured & Indicated 74,233 kt Gold 0.62 g/t 1,470 koz
Inferred 69,890 kt Gold 0.63 g/t 1,422 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required *
Total cash costs Gold USD  ......  Subscription required *
All-in sustaining costs (AISC) Gold USD  ......  Subscription required *
Assumed price Gold USD  ......  Subscription required *
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/ton mined) USD 1.75 *
OP mining costs ($/ton milled) USD  ......  Subscription required
Processing costs ($/ton milled) USD  ......  Subscription required
G&A ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Equipment leasing costs $M USD  ......  Subscription required
Working capital $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 620
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 3
G&A costs $M USD 164
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Operating margin (LOM) $M USD  ......  Subscription required
Net Income (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of February 26, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe ....................... Subscription required 1.3 cu. yd ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
Annual Report 2018
Press Release 2018
Year-end Mineral Reserves 2018
Fact Sheet 2017
Year-end Mineral Reserves 2015
Corporate Presentation 2010
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2017-2022 MDO Data Online Inc.