The Rialto Group is a copper, silver, and lead mine located in Yuma county, Arizona at an elevation of 1,401 feet.
About the MRDS Data:
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.
Mine Info
Elevation: 1,401 Feet (427 Meters)
Commodity: Copper, Silver, Lead
Lat, Long: 33.06028, -114.17778
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Rialto Group MRDS details
Site Name
Primary: Rialto Group
Secondary: Hull Mine Group, Chief of Dome, Diana, Hull & Surprise Claims,
Secondary: Douglas, Railroad, Pocahontas
Secondary: Castle Dome Mine Group
Commodity
Primary: Copper
Primary: Silver
Primary: Lead
Secondary: Fluorine-Fluorite
Secondary: Gold
Tertiary: Molybdenum
Tertiary: Vanadium
Tertiary: Barium-Barite
Location
State: Arizona
County: Yuma
District: Castle Dome District
Land Status
Land ownership: Federal
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: Kofa Game Range
Holdings
Not available
Workings
Type: Underground
Ownership
Owner Name: G. Hull
Years: 1933 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Sonoran Desert
Mineral Deposit Model
Not available
Orebody
Form: IRREGULAR MASES, LENSES
Structure
Type: R
Description: Block Faulting
Alterations
Alteration Type: L
Alteration Text: Strong Sericitization, Also Silicification, Chloritization
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene
Analytical Data
Analytical Data: ABOUT 8333 TONS OF ORE AVERAGING 5% PB, 2% CU, 1.96% OZ/T AG, MINOR AU
Materials
Ore: Fluorite
Ore: Wulfenite
Ore: Vanadinite
Ore: Mimetite
Gangue: Calcite
Gangue: Barite
Comments
Comment (Location): ON W SIDE OF THE CASTLE DOME MOUNTAINS; ABOUT 3 MI N OF CASTLE DOME MINE. INFO FROM LAND.ST :1964
Comment (Production): MOST ORE MINED PRIOR TO 1900 BUT FILL & DUMPS WORKED TO 1960. MAS F PRODUCTION IS ESTIMATE FOR DISTRICT.
Comment (Development): PREVIOUS OWNERS INCLUDE CASTLE DOME MINING & SMELTING CO., GONDOLFO & SANQUINETTI, DE LUCE, CASTLE DOME MINING CO., HULL MINES, REALTO CO., JOPLIN LEAD CO., WALL, DESERT LEAD CO., TAYLOR; THE RIALTO-HULL GROUP IS CONSIDERED AS PART OF THE CASTLE DOME MINE GROUP.
Comment (Deposit): VEIN FOLLOWS A FAULT ZONE IN SHALE. GREEN, PURPLE, AND ROSE COLORED FLUORITE IS ASSOCIATED WITH CALCITE, BARITE, GALENA AND WULFENITE IN VEINS WHERE METASEDIMENTS HAVE BEEN INTRUDED BY RHYOLITE AND DIORITE PORPHYRY. VEINS SPLIT AND BRANCH BUT ARE TRACEABLE FOR AS MUCH AS 4000 FT. FLUORITE ORE IS USUALLY < 5 FT THICK.
Comment (Workings): SEVERAL SHAFTS
Comment (Geology): COVERED BY GRAVEL ON PEDIMENT.
Comment (Deposit): THIS REPORT WAS TAKEN FROM RECORD M030326 OF JAN WILT IN MOLYBDENUM FILE, CONTACT PERSON T.G. THEODORE, USGS. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
References
Reference (Deposit): KEITH, 1978, ABGMT BULL 192.
Reference (Deposit): WILSON, 1933, ABM BULL 134.
Reference (Deposit): WILSON, 1951, ABM BULL 158.
Reference (Deposit): ABGMT FILE DATA.
Reference (Deposit): USBM FILE DATA CLUSTER 343, RIALTO GROUP.
Reference (Deposit): ABGMT-USBM PRODUCTION FILE DATA.
Reference (Deposit): VAN ALSTINE, R.E., 1969, FLUORSPAR, IN ABM BULL 180, USGS BULL 871, P. 354.
Reference (Deposit): MINERALS AVAILABILITY SYSTEMS: ARIZONA FLUORSPAR, ARIZONA DMR, MARCH 1976.
Reference (Deposit): PHILLIPS, K.A., 1987, ARIZONA INDUSTRIAL MINERALS: ARIZONA DEPARTMENT OF MINES AND MINERAL RESOURCES MINERAL REPORT 4, 185 P.
Reference (Other Database): CIMRI
Reference (Production): KEITH, 1978, P. 120; MINERALS AVAILABILITY SYSTEM, 1976.
Arizona Gold
"Where to Find Gold in Arizona" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Arizona. Read more: Where to Find Gold in Arizona.
