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United States
Granite Creek Mine

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 Location:
43 km NE from Winnemucca, Nevada, United States

  Address:
5190 Neil Road, Suite 460
Reno
Nevada, United States
89502
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole stoping
  • Avoca
Production Start...
Mine Life9 years (as of Jan 1, 2021)
The project hosts both high grade open pit and underground mineral resources that remain open for expansion.
The fully permitted Granite Creek underground represents the Company's most advanced project.
Initial rehabilitation of the underground workings was completed in 2021 and additional levels are now being constructed and multiple levels are being prepared for mining. The test mining with a target of ramping up to production in H1-2022.
Initially, material mined from Granite Creek will be trucked for processing at the nearby NGM's Twin Creeks processing facility through the interim processing arrangement that was entered into for processing until the Company's Lone Tree facility is operational.
A Preliminary Economic Assessment for the Granite Creek Mine Project was completed in 2021 and a full feasibility study for the open pit project is planned to be completed in H2-2022.
Latest Newsi-80 Gold Reports Q4 and Full Year 2022 Operating Results     March 14, 2023


Owners

Source: p. 34
CompanyInterestOwnership
i-80 Gold Corp. 100 % Indirect
In April, 2021, i-80 Gold Corp (i-80) through its wholly-owned subsidiary, Premier Gold Mines USA (PGU), acquired Osgood Mining Company LLC (OMC) from Waterton Global Resources Management. OMC being the owner of the Granite Creek Mine Project.

Contractors

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Deposit Type

  • Carlin-type
  • Sediment-hosted


Summary:

The Property is located on the eastern flank of the Osgood Mountains within the Basin and Range tectonic province of northern Nevada. The Granite Creek Mine occurs within a northeast-trending structural corridor known as the Getchell gold trend. Gold mineralization at the Property is described as a Carlin-type, sedimentary-rock hosted system.

The Property geology comprises a sequence of Cambrian to Ordovician sedimentary rocks that form part of the Osgood Mountain Terrane and the Osgood Mountains. Much of the Property comprises shales, hornfels sedimentary rocks and limestone interbeds of the Preble Formation, and an overlying (or juxtaposed), alternating sequence of limestone, shale, and dolomite with tuffaceous shale and intraformational conglomerates belonging to the Comus Formation. The Preble and Comus Formations have been folded into a broad north-plunging anticline and have been intruded by large Cretaceous granodiorite stocks, resulting in irregular contact metamorphism.

Gold mineralization at the Property is strongly structurally controlled, occurring at favorable sites within a fault network occurring around the eastern edge of the Osgood granodiorite and predominantly within Comus Formation host rocks. Mineralization is commonly associated with the decarbonatization of carbonate rocks and the introduction of silica, fine grained pyrite, arsenian pyrite, and remobilized carbon. Continuity of mineralization is highly variable, ranging from 40 ........


Mining Methods

  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole stoping
  • Avoca


Summary:

Mine plans for the resource areas were designed and planned using conventional open pit mining method for the low grade, widely distributed gold. The open pit areas are suitable for phased designs. Mechanized over-hand cut and fill underground mining method for the narrow, high grade deposits. This method was chosen for its ability to mine narrow vein deposits with little dilution and reducing labor cost. The underground area utilizes the previously mined development and includes new development to replace the current access which will be destroyed when the CX pit is mined.

Open Pit
The Granite Creek Mine Project will employ conventional open pit mining techniques using front end loaders and rear dump rigid frame haul trucks. Open pit material will be treated using heap leach or CIL techniques, depending on grade and recovery of the material being processed. The mine plan is designed to deliver an average of 8,500 tonnes of high-grade heap leach material per day from the open pit to the crusher which will then be stacked on the heap leach pad, and 3,000 tonnes per day of CIL material to the mill. The average daily waste production rate over the life of the mine is 80,700 tonnes per day. Waste material would be either placed on waste rock storage facilities (WRSF) or as backfill in previously mined open pits. There are three distinct open pit production areas on the project: B pit, CX pit, and Mag pit. The CX and Mag pits were each designed with three phases, ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnitsLOM (Projected)
Gold oz 1,245,900
All production numbers are expressed as metal in doré.


Reserves at May 4, 2021:
Open Pit Mineral resources are reported at a 0.35 g/t cutoff, an assumed gold price of 1,800 $/tr. oz, using variable recovery, a slope angle of 41 degrees, 6% royalty, heap leach processing cost $9.92 per tonne (includes admin), CIL processing cost of $17.63 per tonne (includes admin).
Underground Mineral Resource Cut-off is 5 gpt based on Mining Cost of $100/ton, Process Cost of $106/ton, recovery of 92%, and a gold price of $1600/t. oz.

Mineral resources are reported at a 0.35 g/t cutoff for .
Cut-off is 5 gpt for Underground Mineral Resource.

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured In-Situ (OP) 20,857 kt Gold 1.47 g/t 988 koz
Measured In-Situ (UG) 483 kt Gold 10.07 g/t 156 koz
Indicated In-Situ (OP) 7,448 kt Gold 1.27 g/t 304 koz
Indicated In-Situ (UG) 525 kt Gold 10.7 g/t 181 koz
Measured & Indicated In-Situ (OP) 28,306 kt Gold 1.42 g/t 1,291 koz
Measured & Indicated In-Situ (UG) 1,008 kt Gold 10.4 g/t 337 koz
Inferred In-Situ (OP) 1,531 kt Gold 1.26 g/t 62 koz
Inferred In-Situ (UG) 741 kt Gold 13.41 g/t 319 koz



Proposed Heavy Mobile Equipment as of May 4, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
ANFO Loader ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 4, 2021
....................... Subscription required ....................... Subscription required Subscription required May 4, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 7, 2022
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Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
Subscription required - Subscription is required.

News:

NewsDate
i-80 Gold Reports Q4 and Full Year 2022 Operating Results March 14, 2023

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