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Rio Vista Southside Mine (Quartz King Mine; Copper Top Mine), Cienega Mining District, Buckskin Mountains, La Paz Co., Arizona, USAi
Regional Level Types
Rio Vista Southside Mine (Quartz King Mine; Copper Top Mine)Mine
Cienega Mining DistrictMining District
Buckskin MountainsMountain Range
La Paz Co.County

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Latitude & Longitude (WGS84):
33° 56' 8'' North , 114° 4' 54'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Bouse996 (2011)7.0km
Utting126 (2011)20.9km
Poston285 (2011)29.6km
Parker3,046 (2017)30.5km
Bluewater725 (2011)30.9km

A former surface and/or underground Cu-Au-Ag mine located in the SE¼ sec. 26 , T10N, R19W, on land of unknown status. Owned at times, or in part, by the Quartz King Gold Mining Co.; Rio Vista Mines; and Osborne & Botsum. Owned and operated by Mr. Huffman (1956). NOTE: Widely varying alternate coordinates provided: 34.1775N, 114.1997W.

Mineralization is spotty ore shoots of copper carbonates and silicate with hematite in a brecciated rock and quartz gangue along parallel, vein-like bodies in a nearly vertical, wide shear zone in folded, metamorphosed Paleozoic-Mesozoic sediments, along an anticline close to a thrust fault zone. Some diabase dike intrusions are present.

Workings include shaft and tunnel openings. This mine was prospected and worked intermittently from the early 1900's to the 1950's, producing some 100 or more tons of ore averaging about 8% Cu, 0.4 ounce Au/ton and 0.1 ounce Ag/ton.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: Au
Reference: Arthur L. Flagg Collection No. 2161
Formula: Fe2O3
Reference: Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geol. Sur. Br. Bull. 192, Index of Mining Properties in Yuma Co., Arizona: 142 (Table 4).
Formula: SiO2
Reference: Arthur L. Flagg Collection No. 2161

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 4 - Oxides and Hydroxides

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

O HematiteFe2O3
O QuartzSiO2
Si QuartzSiO2
Fe HematiteFe2O3
Au GoldAu


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 73-74.
Zambrano, Elias, 1965, Geology of the Cienega mining district, northwest Yuma County, Arizona: Rolla, University of Missouri, M.S. thesis, 64 p., 1 sheet, scale 1:24,000.
Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 142 (Table 4).
Arizona Bureau of Mines file data.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10186705 & 10235012.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0040120168 & 0040120409.

Other Databases

USGS MRDS Record:10186705

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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