Mount Union Mine

  

Mine Info

State: Arizona

County: Yavapai

Elevation: 7,201 feet (2,195 meters)

Primary Mineral: Lead, Gold

Lat, Long: 34.40444, -112.41444



Mine Description

The holdings of “Trapshooter” Reilly Gold Mines include the old Crook, Venezia, Starlight, and Mount Union mines, in Crooks Canyon. These mines are in the vicinity of Venezia post office, which, via the Senator Highway, is 15 miles from Prescott.

During the early days, these mines were rather extensively worked in the oxidized zone, which was generally from 40 to less than 200 feet deep. Later, sulphide ores were mined and treated in a 20-stamp amalgamation-concentration mill at Venezia and in the Mount Union mill. Much of this work was done by the late J. B. Tomlinson and lessees. From 1927 to about 1932, the property was held by the Westerner Gold-Lead Mining Company which, according to the U. S. Mineral Resources of 1930, milled about 100 tons of gold ore and shipped one car of lead-zinc ore. Since about 1932, the property has been held by “Trapshooter” Reilly Gold Mines. This company shipped some bullion and concentrates, but suspended operations in September, 1933.

The total combined production of these mines probably does not exceed $500,000. (57)

This area is composed of ridges and canyons with altitudes of 6,200 to 7,400 feet. It lies in the granite belt that extends southward through Mount Union and contains many dikes of rhyolitic to basic composition.

Mount Union mine: (60) The Mount Union mine, a quarter mile southwest of the summit of Mount Union, at an altitude of 7,400 feet, is accessible by a road that branches eastward at the divide. In 1906, this mine yielded lead ore with gold and silver. A small Huntington mill was operated for a short time, but the total production of the mine was not large.

Here, the rock is Bradshaw granite, cut by many dikes of rhyolite-porphyry. Two veins are reported to occur on the property, one of them from 6 to 10 feet wide, but they do not show well at the surface. Material on the dump shows pyrite, galena, and sphalerite in quartz. According to local reports, the ore was of low grade and the gold difficult to amalgamate.

(57) Lindgren, W., work cited, pp. 123–25.

(60) Abstracted from Lindgren, W., work cited, p. 125.

Text from Arizona Lode Gold Mines and Gold Mining, Arizona Bureau of Mines. Original 1934, revised 1967

Mount Union Mine MRDS details

Site Name

Commodity

Location

Primary: "Mount Union Mine"
Primary: Lead
Primary: Gold
Secondary: Copper
Secondary: Silver
Secondary: Zinc
State: Arizona
County: Yavapai
District: Mount Union District
 

Land Status

Holdings

Workings

Land ownership: National Forest
Administrative Organization:
Type: Underground


Ownership

Production

Deposit

Record Type: Site
Operation Category: Producer
Deposit Type:
Plant Type:
Plant Subtype:
Operation Type: Unknown
Mining Method:
Milling Method:
Year First Production:
Year Last Production:
Discovery Year:
Discovery Method:
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

Mineral Deposit Model

Orebody

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Mexican Highland
Physiographic Detail:
Name:
Form: TABULAR


Structure

Alterations

Rocks

Type: R
Structure:
Description: Foliation In Precambrian Rocks Trends N35e To N45e
Type: L
Structure:
Description: Dikes And Veins Parallel Foliation
Alteration Type: L
Alteration:
Alteration Text: None
Name: Rhyolite
Role: Associated
Description:
Age Type: Associated Rock Unit
Age in Years: 1760.000000+-
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Proterozoic
Age Old:


Analytical Data

Materials

Ore: Chalcopyrite
Ore: Sphalerite
Ore: Galena
Ore: Tetrahedrite
Gangue: Quartz
Unknown: Pyrite


Comments

Comment Type:
Commodity
Comment GOLD DIFFICULT TO AMALGAMATE
Comment Type:
Production
Comment ITEM ( 8 ) IS ESTIMATED FROM $ 125,000 PRODUCTION AT $ 20.67 PER OUNCE.
Comment Type:
Geology
Comment DEPOSIT IS VEIN WHICH CUTS PRECAMBRIAN GRANODIORITE. RHYOLITE PORPHYRY DIKES OF PROBABLE CRET-TERT AGE ASSOCIATED WITH VEINS


References

Reference Category:
Deposit
Pages:
Reference: USGS BULL 782, P. 125
URL:
Reference Category:
Production
Pages:
Reference: A.B.M. BULLETIN 140 , P. 101 .
URL:
Reference Category:
Deposit
Pages:
Reference: ELSING, M.J. AND HEINEMAN, R.E., 1936 , ARIZONA METAL PRODUCTION: ARIZONA BUREAU OF MINES BULLETIN 140 , P. 101
URL:
Reference Category:
Deposit
Pages:
Reference: ABGMT AND ADMR FILE DATA
URL:

Did You Know.......

A mine is a hole in the ground, owned by a liar.
-Mark Twain

About The MRDS Mines Database

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

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