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The Ingersoll Rock Drill (1874)
(1874 Manufacturer and Builder Magazine)
Article describes the advantages of the Ingersoll rock drill.
History and Settlements of the Blue Mountains Gold Belt, Oregon 1900
While the gold fields in the southwestern part of Oregon were discovered about 1852, those of the Blue Mountains remained unknown until about ten years later......
Rock-Boring with Diamonds
(1870 Manufacturer and Builder Magazine)
"the economical superiority of diamond drills over all others, even in rock drilling, however improbable at first sight, has now been perfectly established; and since the first application of the principle by M. Leschot, of Paris, France, in 1860, their use has extended over all the civilized world...."
Metal Mining Districts of Colorado
Colorado metal mining district maps and descriptions compiled by the Colorado Geological Survey.
Idaho Mining Districts
Idaho mining district descriptions from the 1941 publication The Metal and Coal Mining Districts of Idaho by the Idaho Bureau of Mining and Geology
Washington State Mining Districts - Compiled Reports
Mining district descriptions from the 1943 publication Inventory of Mineral Properties in Chelan County, Washington by the Washington Department of Conservation and Development
The Mines and Minerals of Leadville
The Colorado Mining Directory of 1883 called Leadville the “natural successor to Australia and California.” In the century since that statement was made, interest has never waned and production has never entirely ceased. Not only valuable ore but also fine mineral specimens have been recovered and preserved from many of the nearly 2000 mines in the Leadville area.
Mining Districts of Nevada
This collection of over 475 mining districts in the state of Nevada was compiled from reports by the Nevada Bureau of Mines and the USGS.
Placer Gold Deposits of Arizona
Eighty-seven placer districts in Arizona are estimated to have produced a minimum of 564,052 ounces of placer gold from 1774 to 1968. The location, areal extent, past production, mining history, and probable lode source summarized for each district are based on information obtained from a wide variety of published reports relating to placer deposits. Annotated references to all reports that contain information about individual deposits are given for each district.
Mine Locations of the Chilson Brothers
From the May 15 1926 Arizona Mining Journal - the authentic history of the mining activities of the Chilson brothers who were active in the locating and developing of Arizona’s mineral resources.
History of Arizona Gold Mining
Gold mining in Arizona did not start to any appreciable extent until after the acquisition of the territory by the United States from Mexico in 1848 and 1853.
The Gold Cañon Placer Mining Colony
Gold dust was discovered in the Carson Valley as early as 1848 by Mormons traveling to the gold fields of California. However, with seemingly better prospects on the other side of the Sierras, and with supplies dwindling after the long desert crossing from Salt Lake City, nobody stayed to work these placers until at least 1850. By 1851 a small and remote mining colony had formed and was known as the "Gold Cañon Placer Mining Colony", located roughly where the town of Dayton still is today.
Silver Lake Basin: A Mining Chronicle
Silver Lake, which early settlers called Arrastra Lake, lies in a basin at the head of Arrastra Creek, four miles southeast of Silverton, Colorado, near the center of the Las Animas Mining District, in what was then part of La Plata County. Silver Lake Basin was one of the West's most isolated and difficult to access districts. This article explores the incredible feats of transport and engineering were required to make the mines of Silver Lake successful.
History of the Elkhorn Mining District
The Elkhorn district was prospected early in the history of the State and numerous quartz locations were made in the years preceding 1870, but the district did not attract attention until the A. M. Holter lode became a producing mine.
The Los Burros District, Monterey County, California
The following notes concerning the metal prospects of the Los Burros district, in the southwestern part of Monterey County, California, are based on observations made during a visit of a few days to this section of the Santa Lucia Range in February, 1921.
The Mining Towns of California 1873
Tourists will naturally desire to visit some of the towns, where they can observe closely the various operations connected with gold-mining, which is such an important industry of California. This can be done by leaving the main line of railroad at any station in the mining-region and going a little way into the country. Indeed, on the main line of the Central Pacific are several towns, where almost the only occupation of the people is gold-digging.
The Amalgamator - Skidoo 1909
In the early days of lode gold mining, stamp mills were used for crushing the ore. Where there was free gold in the ore, a silver-plated copper plate was placed so that the discharge through the screen from the mortar, with the addition of water, flowed down over this plate which was coated with quicksilver, allowing the free gold to become amalgamated and retained on the plate. The man who operated such a mill was called an amalgamator.
Placer Examination - Principles and Practice
As the title suggests, the subject matter in this book deals for the most part with the examination and testing of placers. It is intended primarily as a guide for the professional mineral examiner who examines mining claims located on public lands of the United States.
City Stands Above Acres of Fire (1909)
When the Berkley mine broke out afire the other day in Butte, Montana, sending five hundred men to the surface and suspending operations for a month in one of the biggest producers of the greatest mining camp on earth -- the camp that gives to the world's market one-fourth of its copper production -- the sight of the flames and smoke didn't cause as much as a ripple of excitement on the surface of the busy population at the foot of the hill, for Butte is accustomed to a mine fire that is perpetual and which burns with intense heat in the ground under her very business district.
The Spenceville Copper Mine
The Spenceville Copper Mine, located in Spenceville, Nevada Co., California, operated between 1863 and 1918. In its day, it was considered one of the most long-lived copper mines in the state.