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United States
Moss Expansion Project (Moss Mine)

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 Location:
8.5 rm SE from Bullhead City, Arizona, United States

  Project Contacts:
2440 Adobe Rd Suite 101
Bullhead City
Arizona, United States
86442
Phone  ...  Subscription required
Fax928-763-6259
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Processing
  • Heap leach
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life10 years (as of Jan 1, 2017)
Latest NewsNorthern Vertex Drilling Intercepts 109.8 Meters of 0.79 gpt Gold & 24.41 gpt Silver     October 15, 2020


Owners

 
CompanyInterestOwnership
Northern Vertex Mining Corp. 100 % Indirect
Golden Vertex Corp. 100 % Direct

Deposit Type

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


Summary:

The Moss deposit is a steeply dipping (average 70°) quartz-calcite vein and stockwork system, which extends over a strike length of approximately 1,400 m in the project area, but can be traced for more than 5.6 km in total length.

The Moss vein system is considered a high level, low-sulfidation (adularia-sericite) epithermal gold-silver deposit in the classification of Heald et al (1987) and White and Hedenquist (1995). Low sulfidation epithermal deposits form from hydrothermal waters in the relatively near-surface environment, typically within 1.5 km of the earth’s surface (Taylor, 2007). They are commonly found associated with magmatism and volcanism, but are somewhat distal (vertically or laterally) from the actual center of magmatism, in environments where meteroric waters have mixed with and diluted magmatic waters.

Epithermal deposits comprise one of three sub- types: high sulphidation; intermediate sulphidation; and low sulphidation. Each sub-type is identified by characteristic alteration and ore-stage mineral assemblages, occurrences, textures and suites of associated geochemical elements. The designation of high sulfidation vs low sulfidation is based on the sulfidation state of the ore-stage sulfide suite, not the abundance of sulfides in the ore. However, precious metals mineralization at Moss is characterized by a low sulfidation suite of minerals and a very low sulfide content (<1%) as well.

The quartz-calcite vein textures at Moss (massive, breccia, vuggy, colloform), are typical of low sulphidation epithermal veins. Gold occurs as very fine native gold and electrum, and silver typically occurs as electrum and very fine grained acanthite, similar to other low-sulfidation precious metals deposits.

The very low (usually trace) levels of base metals in the Moss ores are also consistent with high- level low-sulfidation gold deposits. Alteration related to main-stage precious metals mineralization is confined to silicification and minor sericitization of wallrock adjacent to the veins.

The Moss mineralization differs from typical low- sulfidation precious metals deposits in its lack of adularia (possibly present, but not yet positively identified) and lack of deleterious elements such as arsenic, antimony, and mercury.

The mineralogy of the Moss vein system is simple and the mineralization is nearly void of all deleterious elements. Key elements are:

- Gangue consists of quartz and calcite with minor fluorite locally occurring as late stage veins and vug fillings.

- Gold mineralization is predominantly in the form of very fine grained native gold and silver-rich native gold grading to electrum (an alloy of gold and silver with Ag:Au >1:5).

- Silver occurs as electrum and within the silver- rich gold. Minor native silver has also been identified. In addition, minor amounts of very fine grained, grey to black sulphides (dominantly acanthite, Ag2S) are present as disseminations and occasionally in very thin grey bands in unoxidized or weakly oxidized parts of the veins. The silver minerals bring the overall Ag:Au ratio of the deposit to approximately 8:1.

- Base metals (Cu, Pb, Zn) are very low, especially in the upper parts of the system, but show a slight increase with depth, consistent with low-sulfidation epithermal veins.

- No arsenic or antimony minerals occur.

- Mercury is negligible.


Mining Methods


Summary:

Exploitation of the mineral reserves in the Moss vein and adjacent stockworks on the patented lands will be by open pit mining methods with a conventional drill-blast-load-haul mining fleet.

The PEA mine design removes the patented claims boundary constraint by assuming the pit limits can be extended onto the adjacent Federal lands controlled by the BLM. This allows the PEA mine plan to access the mineral resources not available in the Phase II mine plan. Concurrent with expansion of the pit, the mine facilities would also need to be expanded onto the BLM lands. This would include an expanded heap leach pad to accommodate the additional mineralized material, and an expanded waste rock facility to accommodate the additional waste rock.


Crushing and Grinding


Processing

  • Heap leach
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The most economically effective process has been identified as one that consists of heap leaching of crushed and agglomerated ore, followed by a Merrill Crowe metal recovery plant and refinery to produce gold and silver doré bars on site.

Ore grade material from the open pit will be crushed to 6.35 mm and then agglomerated with cement prior to loading on the heap leach pad in 10m lifts. The crushing circuit will employ three stages of crushing consisting of a primary jaw crusher, a secondary cone crusher, and two tertiary cone crushers. After agglomeration, the fine ore will be conveyed to the leach pad with a series of grasshopper conveyors feeding a radialstacker.

The expanded leach pad is based on the same operating parameters as the Phase II leach pad in terms of tonnes stacked daily, solution application rates, and lift heights. The expanded leach pad geotechnical design will be in accordance with Arizona BADCT protocols, and stacking will be accomplished v ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 0.7
Silver Recovery Rate, %  ......  Subscription required
Silver Head Grade, g/t 8.33
Gold Equivalent Head Grade, g/t 0.83
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsLOM
Gold Payable metal koz 313
Gold Metal in doré koz 313
Silver Payable metal koz  ......  Subscription required
Silver Metal in doré koz  ......  Subscription required
Gold Equivalent Payable metal koz  ......  Subscription required
Gold Equivalent Metal in doré koz  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 1.85 *
Daily milling capacity 5,000 t *
Annual mining capacity 1.9 Mt of ore *
Waste tonnes, LOM 31,601 kt *
Ore tonnes mined, LOM 17,083 kt *
Total tonnes mined, LOM 48,684 kt *
* According to 2017 study.

Reserves at October 10, 2017:

CategoryTonnage CommodityGradeContained Metal
Measured 5,138 kt Gold 0.94 g/t 155 koz
Measured 5,138 kt Silver 10.15 g/t 1,676 koz
Indicated 10,161 kt Gold 0.62 g/t 201 koz
Indicated 10,161 kt Silver 7.93 g/t 2,592 koz
Measured & Indicated 15,299 kt Gold 0.72 g/t 357 koz
Measured & Indicated 15,299 kt Silver 8.68 g/t 4,268 koz
Inferred 1,785 kt Gold 0.44 g/t 5 koz
Inferred 1,785 kt Silver 5.37 g/t 308 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold Equivalent USD 527 / oz *
Cash costs Gold Equivalent USD 418 / oz *†
All-in sustaining costs (sold) Gold Equivalent USD 603 / oz *†
Assumed price Silver USD 20 / oz *
Assumed price Gold USD 1,250 / oz *
* According to 2017 study / presentation.
† Net of By-Product.

Operating Costs:

Units2017
OP mining costs ($/t milled) USD 5.53 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2017 study.
Subscription required - Subscription is required.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 84.2
Refining costs $M USD  ......  Subscription required
G&A costs $M USD 13.3
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 Income (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 0% $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 0% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $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.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 2, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 2, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Preliminary Economic Assessment 2017
Press Release 2017
Feasibility Study Report 2015
Subscription required - Subscription is required.

News:

NewsDate
Northern Vertex Drilling Intercepts 109.8 Meters of 0.79 gpt Gold & 24.41 gpt Silver October 15, 2020
Northern Vertex Intercepts 6.1 Meters @ 9.77 gpt Gold & 36.28 gpt Silver in High-Grade Ruth Vein Located Parallel to the Moss Open Pit Gold and Silver Mine in NW Arizona September 9, 2020
Northern Vertex Intercepts High Grade Mineralization of 21.8 GPT Gold & 211.48 GPT Silver Over 6.1 Meters... August 12, 2020
Northern Vertex Receives Federal Permit for the Expansion of Operations for the Moss Gold Mine In Northwest Arizona March 19, 2020
Northern Vertex Reports Positive Drill Results at Moss Gold Mine, Arizona December 18, 2019

Aerial view:

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