Drift mining

The Boulder-Weld Coal Field beneath Marshall Mesa in Boulder, Colorado was drift mined from 1863 to 1939. Measurements in 2003, 2005, and 2022 showed that the mine has an active coal-seam fire. It was investigated as a possible cause of the 2021 Marshall Fire.[6]

Argyle Lake State Park's website says the Argyle Hollow (occupied by a lake since 1948) has been rich in coal, clay and limestone resources. Historically, individuals commonly opened and dug their own "drift mines" to supplement their income.[7] In Appalachia, small coal mining operations such as these were known as "country bank" or "farmer" coal mines, and usually produced only small quantities for local use.[8]

The Lusk Mine, now in Turkey Run State Park, was in operation from the late 1800s through the late 1920s. Too small for commercial operation, the mine probably provided coal for the Lusk family and later for the park.[9]

In 1820 the first commercial mine in Kentucky, known as the "McLean drift bank" opened near the Green River and Paradise in Muhlenberg County.[10] In Drift, Kentucky, Beaver Coal & Mining Company was the most well known operator of mines, but there were other smaller mines (Floyd-Elkhorn Consolidated Collieries, Turner-Elkhorn Coal Company, etc.) as well.[11]

Dorsey Coal Company's Ashby coal mine, a small drift mine probably in the Upper Freeport coal; and the mine of the Taylor-Offutt Coal Company near Oakland, MD.[12]

In the 1880s, State Inspector of Mines, Andrew Roy, issued a report on the Mines and Mining Resources of Ohio,[13] which includes the following paragraphs:

The capacity or output of the mines of the State varies greatly. Thick coals are capable of a greater daily output than thin seams, and as a general rule drift mines possess greater advantages for loading coal rapidly than shaft mining openings. In many of the mines of the great vein region of the Hocking valley the capacity is equal to 1,200 to 1,500 tons per day. In shaft mines 600 to 700 tons daily is regarded as a good output.

The first ton of coal in a shaft mine 100 feet in depth and having a daily capacity of 600 tons frequently costs the mining adventurer upwards of $20,000 (1888), and cases are on record where owing to the extraordinary amount of water in sinking, $100,000 (1888) have been expended before coal was reached. Drift mines, as they require no machinery for pumping water and raising coal, cost less than half the amount required in shaft mining.

Water is, however, an expensive item in drift mines opened on the dip slope of the coal, and underground hauling under such conditions is unusually costly.

Drift mine entry in West Virginia, 1908. Photo by Lewis Hine.

Indiana County: Graff Drift Mines, near Blairsville. Commodore Mines, Nos. 1 & 3 (drift mines), No. 2 (slope mine), Green Twp. Empire "F" Mine (1910-?), Shanktown; a drift mine, mining the "B" coal seam, mining done by machine, owner Pioneer Coal Company, Clearfield. Empire "M" Mine (McKean Mine) (1906-?), a drift mine, non-gaseous, mining a 38" thick seam of Lower Kittaning coal using compressed air machines; ventilation provided by an 8' Stine steam-powered fan, Clymer, PA. Rodkey Mine(1906-?), a drift mine, Clymer. Ernest Mine No. 2 (1903-1965), a drift mine, at Ernest, Rayne Twp., Indiana Co., PA.[14]

The Fork Mountain, TN, drift portal entered an 84-inch unnamed seam of coal (see picture above). Most coal seams in Tennessee were not this thick.[15]

The first coal mine in the Pocahontas Coalfield with its famous 13 feet tall seam of Pocahontas No. 3 coal, the Pocahontas mine is a drift mine.[16]

Many, many references to and photographs of WV drift mines in the Scrapbook of Appalachian Coal Towns,[17] including Sprague, Kaymoor, Nuttallburg, Venus, Layland, Elverton, Casselman (aka Castleman), etc.

Drift mining methods were used extensively to mine placer deposits during the early years (1899- ) of the Nome mining district. During summer, surface deposits could be worked, but some placer deposits were buried too deeply for surface placering. In addition, water to wash the gold from the placers was not available in the winter. Many miners tunneled into deep placer deposits, bringing out the high-grade gravels to be washed at the spring thaw. Most of the ground in Nome is permafrost. By drift mining, miners were able to recover much of the gold buried under the permafrost.

Gold at Nome was concentrated in three ancient beach lines, now inshore, above sea level, and buried under roughly fifty feet of permafrost overlain by two feet of tundra. Gold was usually found on top of "false bedrock," a layer of clay that occurred at the base of the beach or stream deposit. Miners initially sank shafts to prospect for the pay streaks by building a fire atop the permafrost, then as it melted, shoveling away the mud. The process would continue down to either a pay streak or bedrock.

When gold was found drift mining began. Miners would tunnel horizontally from the bottom of their prospect shaft to follow the gold along the surface of the bedrock. The tunnels did not cave in because the ground was frozen. Miners discovered old underground beach and river gravels rich with gold. Around 1900 the population of Nome was more than twenty thousand, many of them drift miners. Nome's gold fields, appearing untouched from the surface, are honeycombed with tunnels left by the gold rush drift miners. Today's miners, prospecting with modern drilling equipment, sometimes hit old drifts; this was, and is, a technique copied from the Welsh coal miners of south Wales and is much more effective than using bell pits.

Gold has been mined from placer gold deposits up and down the state and in varied environments. Initially, easily discovered deposits in surface and river placers were mined until about 1864. Hydraulic mines, using powerful water cannons to wash whole hillsides, were the chief sources of gold for the next 20 years. In 1884, Judge Lorenzo Sawyer issued a decree prohibiting the dumping of hydraulic mining debris into the Sacramento River, effectively eliminating large-scale hydraulic operations. For the next 14 years, drift mining placer gold deposits in buried Tertiary channels partially made up for the loss of placer gold production, but overall production declined. Production rose again with the advent of large-scale dredging. The first successful gold dredge was introduced on the lower Feather River near Oroville in 1898.[18]