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United States
Mineral Ridge Mine (Mineral Ridge Expansion Project)

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 Location:
6 km NW from Silver Peak, Nevada, United States

  Address:
1515 7th Street
Elko
Nevada, United States
89801
Phone  ...  Subscription required
Fax(775)-753-4780
WebsiteWeb
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Overview

StageResidual leach
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life7.5 years (as of Jan 1, 2018)
Mining was suspended at Mineral Ridge in early November 2017. On January 4, 2018, the Company announced an updated feasibility study outlining positive economics for processing the residual heap leach material and mining of higher-grade mineralization in the existing pits. The study provides ~7.5 years of additional mine life at Mineral Ridge and 250,500 oz. life of project gold sold at a total cash cost of US$805/oz. The Company is pursuing financing for the construction of a 4,000 TPD milling facility with CIL recovery and dry stack tailings circuit.
Latest NewsScorpio Gold Receives Permit to Advance Mining, Processing & Exploration Activities at its 100% owned Mineral Ridge Operation, Nevada     June 24, 2019


Owners & OPERATOR

Source: p. 1
CompanyInterestOwnership
Scorpio Gold Corp. 100 % Indirect
Mineral Ridge Gold, LLC (operator) 100 % Direct

Deposit Type

  • Vein / narrow vein


Summary:

The Mineral Ridge gold deposits occur on the northeast flank of the Silver Peak range of the Silver Peak mining district. The mining district occurs along the Walker Lane structural corridor, a structurally complex region, with the Sierra Batholith to the west and the Basin and Range Province to the east. Within the corridor, Precambrian through Cenozoic age metamorphic, intrusive and sedimentary rocks occur that have been subjected to folding and thrust faulting, low angle extensional deformation, and high-angle faulting.

The precious metal deposits at Mineral Ridge consist of structurally controlled gold mineralization hosted by the lowermost unit of the Wyman Formation. The gold mineralization is invariably associated with quartz impregnations either as:
• Quartz veins and veinlets/stringers in alaskite
• Quartz veins and veinlets/stringers in Wyman Formation limestone
• Quartz veins ranging from about one foot to over 15 ft

Dilation resulting from multiple periods of dip-slip movement along a series of braided extensional faults created the conduits for the multi-stage emplacement of quartz and the attendant gold mineralization. In this sense, the Mineral Ridge deposits are considered to be detachment fault hosted.

The gold bearing quartz impregnations were emplaced along low-angle or bedding plane extensional faults developed in the limestone and alaskite rocks. There are two or more phases of quartz injection but it is apparent that only one phase is associated with the gold mineralization.

Gold is present as native gold and electrum that occurs as irregular shaped intergrowths in quartz associated with interstitial space and small fractures. Gold also occurs as irregularly shaped intergrowths and as fracture fillings associated with goethite, much of which was derived from original pyrite. In partially oxidized mineralization, gold occurs with both pyrite and goethite. Gold particle size varies from 1 to 2 microns to about 700 microns, but most of the particles are in the 5 to 50 micron size range, and should not lead to a significant particle nugget effect problem. Gold to silver ratios are typically in the 2:1 range. Because of the small gold particle size and intergrowths with quartz, extensive crushing is needed to allow for the effective cyanide heap leaching of the gold. Locally, minor amounts of galena, sphalerite and anglesite/cerrusite have been observed in the mineralization.

The gold mineralization at Mineral Ridge is primarily associated with milky quartz veins and lenses accompanied by local argillization and some sericitization. The individual zones can be as much as 50 ft thick, typically consisting of a higher grade quartz veins from five to 30 ft thick, surrounded by a lower grade envelope of mineralization. Two or more high grade zones are commonly observed stacked in en echelon patterns. Gold deposition is structurally controlled, and some of the highest grade mineralization is found in shoots that are at an oblique angle to the direction of movement of extension.

Gold is present as native gold and electrum that occurs as irregular shaped intergrowths in quartz associated with interstitial space and small fractures. Gold also occurs as irregularly shaped intergrowths and as fracture fillings associated with goethite, much of which was derived from original pyrite. In partially oxidized mineralization, gold occurs with both pyrite and goethite. Gold particle size varies from 1 to 2 microns to about 700 microns, but most of the particles are in the 5 to 50 micron size range, and should not lead to a significant particle nugget effect problem. Gold to silver ratios are typically in the 2:1 range. Because of the small gold particle size and intergrowths with quartz, extensive crushing is needed to allow for the effective cyanide heap leaching of the gold. Locally, minor amounts of galena, sphalerite and anglesite/cerrusite have been observed in the mineralization.

Gold deposits on the Mineral Ridge Property are hosted within a structural envelope in the lower unit of the Wyman Formation near its contact with the crystalline core rocks. Quartz and felsic intrusive boundaries are common in this structural zone. These boundaries are elongate within, and sub-parallel to the direction of extension as a whole and are exposed in outcrop and in the underground workings. Elongate, braided, ductile shear zones surround the boundaries, with these shear zones being preferentially in-filled by milky quartz veining associated with mineralization and the better gold grades. This zone of ductile shearing comprises the structural mineralized envelope, and is internal, and sub-parallel to the limits of the structural slab. Internal to the mineralized envelope, other, smaller-scale fault and fold sets occur, which correspond to higher grade mineralized shoots. Based on mapping of the historical underground stopes within the Mary and Drinkwater deposits, some of the high grade shoots historically exploited by underground methods were localized at the inflection point of small flexures where dilation zones were formed when the limb of the fold steepened. These shoots lie at an angle of 38° to 45° from the horizontal, versus the average 25° angle of the structural zone. It is believed that the highest-grade mineralized shoots are related to a second, perpendicular set of flexures accompanied by normal faulting that intersect the dilation zones.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mineral deposits at the Project are being mined by conventional open pit mining methods. A mining contractor is being utilized to perform all mining functions including: blasthole drilling, blasting, loading and hauling, as well as road and pit maintenance functions.

The Mary pit is the largest of the pits with an overall strip ratio of 8.3:1 (waste:ore). Access to the Mary pit is via the existing ramp system. A new access is being developed by dumping waste material to the southeast of the final pit limits at a gradient of 10%. This new ramp will access the lower benches of the pit and is expected to be completed in the third quarter of 2014. With the exception of the last three benches accessed via a 40 ft single lane ramp, ramp widths are designed at 80 ft. The pit was designed to use 10 foot single bench with up to six benches mined before leaving a 22 ft catch bench. This corresponds to the mineral resource model block height. The benching system varies within the pit due to the access ramp and pit slope constraints. The final pit design utilizes a spiral ramp system to maintain a uniform ingress and egress for the pit. Mining in the Drinkwater pit will be completed in August of 2014. The remaining strip ratio in the Drinkwater pit is 1.9:1 (waste:ore). Access to this pit is via a haul ramp which utilizes switchbacks to maintain the road system on the south side or footwall of the Drinkwater pit. As the physical size of the two pits is relatively small, each pit is mined and scheduled as a single phase.

The satellite pits (Bluelite, Solberry, Brodie, and Wedge) are all relatively small pits. The satellite pits have an overall strip ratio of 7.4:1 (waste:ore). Access to the pits is developed using a spiral ramp system or a slot cut (Brodie pit) where appropriate. Access to each of the Satellite pits is via 50 foot single lane ramps with pullouts designed to allow the use of 100-ton haul trucks.


Crushing and Grinding


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

MRG processes ore at Mineral Ridge with multi-stage crushing (four stages) that produces an 80% minus 6 mesh material that is agglomerated with cement and stacked on a heap leach pad. The ore is leached at a solution application rate of 0.0025 to 0.0040 gpm/ ft² of heap surface. Solution passing through the stacked ore on the heap leach is discharged out the base of the pad via 10” perforated HDPE lines. These 10 inch lines discharge into the HDPE double lined pregnant pond which is then pumped into the ADR plant where the solution is contacted with activated carbon in a five cell vertical column Carbon-in-Column (CIC) system for recoveries of the precious metals contained. The solution exits the column reporting to a HDPE double lined barren pond. A pump system then pumps the solution back onto the heap leach pad for further leaching. The carbon is loaded to approximately 100 oz/ton gold and is removed from the column and sent to Kimberley, Idaho for custom stripping by Metals Researc ........

Recoveries & Grades:

CommodityParameter201920172016201520142013
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.571.441.521.722.32
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Gold oz  ......  Subscription required  ......  Subscription required19,04536,87939,69040,814
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20172016201520142013
Total tonnes mined  ......  Subscription required5,104,882 t7,764,789 t6,485,523 t5,195,374 t
Ore tonnes mined  ......  Subscription required750,204 t984,850 t919,577 t893,223 t
Waste  ......  Subscription required4,354,678 t6,779,939 t5,565,946 t4,302,151 t
Daily mining rate  ......  Subscription required18,167 t23,901 t
Tonnes processed  ......  Subscription required846,140 t891,997 t974,346 t903,337 t
Stripping / waste ratio  ......  Subscription required5.4

Reserves at January 2, 2018:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 2,474 k tons Gold 0.047 oz/ton 116.2 koz
Probable In-Situ (OP) 1,239 k tons Gold 0.032 oz/ton 40.1 koz
Proven & Probable In-Situ (OP) 3,713 k tons Gold 0.042 oz/ton 156.3 koz
Proven & Probable Leach Pad 6,855 k tons Gold 0.017 oz/ton 117.2 koz
Proven & Probable Leach Pad 6,855 k tons Silver 0.017 oz/ton 115.9 koz
Measured In-Situ (OP) 2,088 k tons Gold 0.074 oz/ton 155.2 koz
Measured Leach Pad 2,895 k tons Gold 0.017 oz/ton 48.5 koz
Measured Leach Pad 2,895 k tons Silver 0.016 oz/ton 46.4 koz
Indicated In-Situ (OP) 1,095 k tons Gold 0.066 oz/ton 72.6 koz
Indicated Leach Pad 4,220 k tons Gold 0.017 oz/ton 73.2 koz
Indicated Leach Pad 4,220 k tons Silver 0.018 oz/ton 74.1 koz
Measured & Indicated In-Situ (OP) 3,183 k tons Gold 0.072 oz/ton 227.8 koz
Measured & Indicated Leach Pad 7,117 k tons Gold 0.017 oz/ton 121.7 koz
Measured & Indicated Leach Pad 7,117 k tons Silver 0.017 oz/ton 120.4 koz
Inferred In-Situ (OP) 182.9 k tons Gold 0.059 oz/ton 10.73 koz
Inferred Leach Pad 76 k tons Gold 0.016 oz/ton 1.2 koz
Inferred Leach Pad 76 k tons Silver 0.027 oz/ton 2 koz

Commodity Production Costs:

CommodityUnits2019201820172016201520142013
Cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 1,013 / oz† 862 / oz† 780 / oz†
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 1,026 / oz† 881 / oz† 781 / oz† 845 / oz† 734 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 44.6   52  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -5.49   -25.22  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -6.06   -25.65  
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 2, 2018:
HME TypeQuantity
Backhoe 1
Grader 1
Rockbreaker 1
Truck (dump) 1

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 2, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Corporate Presentation 2017
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Other 2017
Financial Review 2016
Management Discussion & Analysis 2016
Financial Review 2015
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Scorpio Gold Receives Permit to Advance Mining, Processing & Exploration Activities at its 100% owned Mineral Ridge Operation, Nevada June 24, 2019
Scorpio Gold Announces Completion of Waterton Buyout to Eliminate Senior Secured Debt and Acquire a 100% Interest in the Mineral Ridge Property March 6, 2019

Aerial view:

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