iBook Example

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Open iBooks on your iPad by tapping it’s icon.


iBooks will open. Select “Top Charts” at the bottom of the window.

In the upper right corner type “Arizona Gold Placers” 

Select “Arizona Gold Placers, Yuma County” when the search completes. The iBook will download to your iPad and open in iBooks as depicted below.

Gold Placers
Yuma County
By: Richard Lampright


♦ Diamonds shows placer gold locations.  ★ Stars show gold-bearing hard rock locations. Hard rock occurrences are not identified by name nor is a description of the occurrence included in this book. They are provided so the reader can see where the hard rock sources for the placer deposits occur. Areas are located by latitude and longitude WGS 84 coordinates.

Alamo Mine 
(Gold) Coordinates: 33.42445°N, 113.88823°W Access: From Yuma, 59 miles east and north on State Highway 95 to dirt road leading east about 15 miles to dirt road leading about 10 miles north to the Kofa Mountains. Summary: An underground placer mine located in conglomerate with high gold values. Located near Alamo Spring (33.41116°N, 113.92396°W) in the Kofa Mountains (T. 1 N., R. 16 W.). Mineralization: Spotty, finely divided, free gold in fractures. Gold can be obtained by panning. Source: According to Jones (1916), who studied the Kofa placer in detail, the source of the gold was small auriferous veins in the metamorphic rocks exposed north of the placer deposits in sec. 1, T. 2 S., R. 17 W., and not from the King of Arizona mine. References: Johnson, Maureen G., Gold Placer Deposits of Arizona, Geological Survey Bulletin 1355, p. 73 

Big Eye Mine 
(Gold) Coordinates: 33.04234°N, 114.10010°W Access: From Yuma, about 24 miles east and north on State Highway 95 to light-duty road leading east about 15 miles to jeep trail leading north along Big Eye Wash.  Extent: The placers in the Castle Dome district are reportedly located east and south of the Big Eye mine, a gold-quartz mine, at the head of Big Eye Wash, north of Thumb Peak (approximately sec. 34, T. 4 S., R. 18 W., unsurveyed). The gold is found near bedrock in gulches, but the exact location is unknown. Production history: The placers are said to have been discovered in 1884, but the description of the discovery given equally fits the Tank Mountains placers (No. 73). Production during the 20th century was apparently small but nearly continuous until 1944. During the period 1940-42, a few hundred ounces of placer gold was recovered yearly from the Ocatilla placer (unlocated) by miners using a Stebbins dry concentrator. Source: The gold is thought to be derived from the gold-quartz veins in the vicinity of the placers. The Castle Dome district is more famous for lead-silver veins near the Castle Dome mine (at the west side of the range) than for the gold-quartz veins, which are found in the eastern part of the range. References: Johnson, Maureen G., Gold Placer Deposits of Arizona, Geological Survey Bulletin 1355, p. 71 
Big Horn Prospect 
(Gold) Coordinates: 33.35129°N, 113.88640°W Summary: Gold prospect/mine located in SW¼ sec. 11, T1S, R16W, near Ocotillo, in the northern Kofa Mountains, on federal land. Mineralization: Spotty, finely divided, free gold in fractures and breccia with gouge, calcite, and iron and manganese oxides, in andesitic volcanics. Several small shear zones in the andesite porphyry stained with Fe & Mn oxides. A shear zone several feet wide, with 2 inches of slickensided gouge exposed in the shaft. Country rock is andesite porphyry in gray, brown or purple and containing abundant altered calcic feldspars in a dense groundmass. Workings: A 120 foot tunnel that connects with a shaft 35 feet below the collar. The tunnel is driven N.25ºE.'