Rochester, Nevada

Silver-Gold Operation

Overview

The Rochester mine and associated heap leach facilities is a surface silver and gold mine, located in Pershing County, Nevada. The mine is accessed by approximately 25 miles of paved and all-weather gravel road northeast of the town of Lovelock. The Company owns 100% of the Rochester mine through its wholly-owned subsidiary, Coeur Rochester, Inc. (“Coeur Rochester”), subject to royalty provisions to former owner ASARCO and Rye Patch Gold Corp. The mine consists of the main Rochester deposit and the adjacent Nevada Packard deposit, located three miles south of the Rochester mine.

The Rochester mine is fully supported with electricity, supplied by a local power company on its public grid, telephone and radio communications, production water wells, and processing, maintenance, warehouse and office facilities. 

2012 Rochester Location Map
Stage: Open Pit & Heap Leach 
Location: Near Lovelock (West-Central Nevada, USA)
Type: Open-Pit, Surface Mine
Metals: Silver and Gold
Product: Doré
Ownership: 100%
Land position: +10,800 acres (43.7 square kilometers)
Production: 201​5 = ​4.6M oz Ag and 52,588 oz Au
​Adjusted costs applicable to sales per silver equivalent ounce1: $​12.36 per AgEq oz, using a 60:1 ration; $11.27 per realized AgEq oz
Proven and probable reserves2: ​79.3M oz Ag and ​477,000 oz Au
Measured and indicated resources2: ​67.5M oz Ag and ​483,000 oz Au 
Inferred resources2: ​31.2M oz Ag and ​179,000 oz Au
Employees: ​301

Operations

The mine utilizes the heap leaching process to extract both silver and gold from ore mined using conventional surface mining methods. Gold and silver are recovered by leaching of crushed ore placed on pads located east of the Rochester pit. Based upon actual operating experience and metallurgical testing, the Company estimates ultimate recovery rates from the crushed ore of between 59.0% and 63.0% for silver, depending on the ore being leached, and 93.0% for gold.

View the latest Technical Report for the Rochester mine.

Geology and Exploration Potential 

At Rochester, silver and gold mineralization is hosted in folded and faulted volcanic rocks of the Rochester Formation and overlying Weaver Formation. Silver and gold, consisting of silver sulfosalt minerals, argentite, silver-bearing tetrahedrite and minor native gold, are contained in zones of multiple quartz veins, veinlets and stockworks with variable amounts of pyrite.

  1. Non-GAAP financial measure. Please see Reconciliation to GAAP table.
  2. Please see Reserves and Resources statement.

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Coeur Mining, Inc.
104 S. Michigan Avenue, Suite 900 Chicago, Illinois, 60603 - (312) 489-5800