• 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
Liberty Project

This page is not tailored to
devices with screen width under 750 px.
 Location:
29 km N from Tonopah, Nevada, United States

  Project Contacts:
790 Commercial St., Suite B
Elko
Nevada, United States
89801
Phone  ...  Subscription required
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
  • 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

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Molybdenum
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life32 years (as of Jan 1, 2014)
The Liberty Project remains largely in care and maintenance at this time.
Latest NewsGeneral Moly Announces Entry into Letter of Intent to Sell the Liberty Project     September 3, 2020


Owners

Source: p. 14
CompanyInterestOwnership
General Moly Corp. 100 % Direct
The property owner is General Moly, Inc. (GMI), a public company traded in Canada and the U.S.

Deposit Type

  • Vein / narrow vein
  • Porphyry


Summary:

Base metal mineralization in the Liberty deposit consists of molybdenite (MoS2), chalcopyrite (CuFeS2), chalcocite (Cu2S), galena (PbS), sphalerite (ZnS), tetrahedrite (Cu8Sb2S7), and pyrite (FeS2). Molybdenite occurs mainly in 0.1" to 1.2"-wide quartz veins and veinlets in amounts that range from 0.1% to more than 40% by volume, typically as a selvage on vein walls. Molybdenite is also found in wider (+1.2”) quartz veins, but these are much less common in occurrence. Chalcopyrite and pyrite also are common but lesser vein/veinlet constituents. Galena, sphalerite, and lesser tetrahedrite occur with quartz in separate generations of base metal veins and veinlets that were emplaced at the end of each mineralization pulse (Shaver, 1991).

In general, molybdenum-bearing quartz veins and veinlets are more concentrated along the margins of the Hall stock, forming an irregular shell or sleeve of higher grade mineralization around a lower grade core. However, the intensity of quartz veining does not correlate directly with higher grade molybdenum – barren quartz veins are common within the deposit. Disseminated molybdenite is rare, occurring only in a 100'- to 200'- thick portion of the North Hall stock as replacements in biotite and/or plagioclase sites (Shaver, 1991). In addition to quartz, minor gangue minerals present in the veins and veinlets include fluorite, scheelite, tourmaline, gearksutite, and creedite, with siderite, dolomite, and calcite occurring as vug fillings.

The average grade (0.080% Mo) of the quartz monzonite porphyry (Kqmp) is higher than the average grade (0.064% Mo) of the orthoclase-rich intrusive rocks (Kamp). Part of the reason for this may be that the Kamp is more prevalent in the interior portion of the stock, while Kqmp is the dominant rock type along this portion of the stock margins (particularly the west and southwest sides), where quartz-molybdenum veining is more
concentrated.

Although chalcopyrite can occur with molybdenite in minor amounts in veins and veinlets within the main body of molybdenum mineralization in the Hall stock, it is much more prevalent in quartz veins in the metasediments on the northeast and east sides of the stock. Here it occurs in the remnant of the copper-dominant shell that originally surrounded the Hall stock before it was tilted and disrupted by faulting. In addition to chalcopyrite, chalcocite occurs as disseminations and as secondary coatings on pyrite within a roughly horizontal blanket of secondary supergene copper enrichment just below the bottom of oxidation. Definition of this supergene copper blanket is based on a combination of reverse circulation and diamond core drill holes that penetrate this portion of the deposit and on pit bench exposures from mining by Equatorial in 2000 – 2002. The thickness of the supergene blanket ranges from a few feet to 170 ft, and averages approximately 85 ft. Although generally horizontal and laterally continuous, the supergene blanket is locally offset by post-mineral faulting, particularly towards the main body of molybdenum mineralization to west. Copper grades in the supergene zone range from 0.06% Cu to 1.71% Cu, and average around 0.31% Cu. Beneath the supergene blanket, the chalcopyrite content of the sulfide zone is generally very low.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Liberty mine project will employ conventional hard rock, open pit mining methods. Ore production to the mill is planned at 26,500 short tons per day (st/d) (9,673,000 short tons per year). The mine plan and production schedule was developed with the goal of filling the mill at the required ore rate and maximizing the project return on investment. The total material rate starts at 32 million short tons per year (Mst/y) for the first six years and then ramps up to 42 Mst/y for six years before reducing to lower levels for the last half of the mine life.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The results of metallurgical testing have indicated that conventional flotation technology can be used to recover copper and molybdenum from the project feed material. The design basis for the processing facility is 26,500 dry short tons per day (dst/d) or 9.67 million dry short tons per year (st/y). It is contemplated that feed will be transported from the mine to the concentrator facility by off-highway haulage trucks. Mineralized material would then be processed to produce copper and molybdenum sulfide concentrates, with the copper concentrate being shipped by truck and the molybdenum concentrate packaged in super-sacks.

The proposed process operations are as follows:

- Crushing of the feed by primary gyratory crusher to reduce the feed size from run of mine to minus 6 inch.

- Stacking of primary crushed feed in a coarse ore stockpile and then reclaiming by in-tunnel feeders and conveyor belts, with one feed system for each of the two grinding lines ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Molybdenum Recovery Rate, % 83.2
Molybdenum Head Grade, % 0.078
Copper Recovery Rate, % 50.9
Copper Head Grade, % 0.1

Projected Production:

CommodityUnitsAvg. AnnualLOM
Molybdenum M lbs 13402
Copper M lbs  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal.

Operational Metrics:

Metrics
Stripping / waste ratio 1.78 *
Daily milling capacity 26,500 tons *
Daily ore mining rate 26,500 tons *
Waste tonnes, LOM 550 M tons *
Ore tonnes mined, LOM 310 M tons *
Total tonnes mined, LOM 859 M tons *
Tonnes milled, LOM 309 M tons *
Annual milling capacity 9.67 M tons *
* According to 2014 study.

Reserves at July 30, 2014:

CategoryTonnage CommodityGradeContained Metal
Proven 92,489 k tons Molybdenum 0.101 % 187 M lbs
Proven 92,489 k tons Copper 0.056 % 104 M lbs
Probable 216,727 k tons Molybdenum 0.068 % 295 M lbs
Probable 216,727 k tons Copper 0.116 % 503 M lbs
Proven & Probable 309,216 k tons Molybdenum 0.078 % 482 M lbs
Proven & Probable 309,216 k tons Copper 0.098 % 606 M lbs
Measured 125,538 k tons Molybdenum 0.093 % 233.5 M lbs
Measured 125,538 k tons Copper 0.051 % 128 M lbs
Indicated 440,621 k tons Molybdenum 0.06 % 528.7 M lbs
Indicated 440,621 k tons Copper 0.094 % 828.4 M lbs
Measured & Indicated 566,159 k tons Molybdenum 0.067 % 762.2 M lbs
Measured & Indicated 566,159 k tons Copper 0.084 % 956.4 M lbs
Inferred 148,598 k tons Molybdenum 0.052 % 154.5 M lbs
Inferred 148,598 k tons Copper 0.115 % 341.8 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Molybdenum USD -2.49 / lb *
Site cash costs (produced) Molybdenum USD 8.78 / lb *
Site cash costs (produced) Molybdenum USD 6.29 / lb *†
Total cash costs Molybdenum USD 10.4 / lb *
Total cash costs Molybdenum USD 7.94 / lb *†
Assumed price Molybdenum USD 15 / lb *
Assumed price Copper USD 3.25 / lb *
* According to 2014 study / presentation.
† Net of By-Product.

Operating Costs:

Units2014
OP mining costs ($/ton milled) USD 4.88 *
Processing costs ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2014 study.
Subscription required - Subscription is required.

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,745
G&A costs $M USD 232.8
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of July 30, 2014:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 2018
Pre-Feasibility Study Report 2014
Subscription required - Subscription is required.

News:

NewsDate
General Moly Announces Entry into Letter of Intent to Sell the Liberty Project September 3, 2020

Aerial view:

Subscription required - Subscription is required.

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