Boarder Gold Mine

Site Name Boarder Mine A.K.A. Boarder Gold
Commodity: Gold (Major) Silver (Minor) Copper (Minor)
Location: Esmeralda County, Nevada
Primary: "Boarder Gold Deposit"
Primary: Gold
Secondary: Silver
Secondary: Copper
State: Nevada
County: Esmeralda
District: Goldfield District:

Land Status
Land Ownership: BLM Administrative Area
Administrative Organization: Tonopah District BLM

Owner Name: Aurum Exploration, Inc.
Info Year: 2013
Years: 1.5
Record Type: Site

Operation Category: Past Producer
Deposit Type: silicified zones at shear intersections
Operation Type: Surface-Underground
Year First Production: 1904
Year Last Production: > 1970
Discovery Year: 1901
Discovery Method:

Years of Production: 1904-1970s
Significant: Y
Deposit Size: M

Orebody
Model Name: Epithermal quartz-alunite Au
Form: Irregular to tabular or knobby

Structure
Alterations
Rocks
Type: L

Structure:

Description: The Boarder Mine Deposit is located to the west of the ring fracture zone that controls the main Goldfield deposits.
Type: R

Structure:
Description: Tertiary deposits are domed and faulted by steeply dipping post Miocene: N-S and E-W faults.
Alteration Type: L

Alteration:
Alteration Text: Large envelopes of intense argillic alteration surround most of the ore zones with silicification of core ore zones.

Name: Rhyolite
Role: Host
Description:
Age Type: Host Rock
Age in Years:
Dating Method:
Material Analyzed:
Age Young: Oligocene
Age Old:

Analytical Data
Materials
Ore: Gold
Gangue: Quartz
Gangue: Alunite
Gangue: Barite
Gangue: Gypsum
Gangue: Limonite
Gangue: Kaolin

Commodity Comment Ore Materials: gold
Commodity Comment Gangue Materials: quartz, alunite, barite, gypsum, limonite, kaolin

Economic Factors Comment Historic recorded production from the main Goldfield district is 4,190,133 ounces of gold at an average 0.541 oz/ton gold, including about 160,800 ounces of gold from reworked tailings. 1996 reserves of the Gemfield area were reported at 9.5 million tons of ore grading 0.04 opt Au.for a total of about 500,000 ounces of gold. In 2006, Metallic Ventures Gold Inc. announced recent in-fill drill results and reported a resource for the Gemfield Project of 9,500,000 tons of material grading 0.040 ounces of gold per ton.

Comment Type:
Geology Comment The Goldfield mining district is located at the site of a complex and long-lived igneous intrusive and volcanic center that is defined by eruptive vents and curviplanar faults. The local volcanic stratigraphy, a moderately well-defined ring-fracture zone, concentric structural doming, high sulfidation-style quartz-alunite hydrothermal alteration, and widespread copper-gold mineralization are all genetically related to the emplacement of a large dominantly andesitic igneous complex and the most significant components of which are late Oligocene to early Miocene in age..

Comment Type:
Workings Comment Older workings were predominantly underground with later surface workings.