At that time mined-out stopes were not backfilled with waste rock, but one on the level had been filled over the years with mining debris such as powder boxes, sawdust and wooden crates.
12.
The works to be executed include the retaining wall, tower, tunnel, aqueduct, drainage, harness works, roads, complementary works, as well as the removal of coal mine debris, ICA announced Tuesday.
13.
It was created in 1939 when the "'North Fork Dam "', a tall variable radius arch dam, was completed by the Army Corps of Engineers for the purpose of containing gold mining debris washing downriver.
14.
Like many communities that depended on hydraulic mining, Blue Tent began to decline following the 1884 Sawyer decision, forbidding the discharge of mining debris into the Yuba River . By the early 1890s, the Blue Tent mine was closed.
15.
Surface mining is destroying some of its habitat, but it is not considered to be fragmented, and so is listed as Near Threatened by the IUCN . It can also be found growing in other metalliferous habitats, such as mine debris and lands disturbed by mining.
16.
Fictional subterrenes are often depicted as cylindrical in shape with conical drill heads at one or both ends, sometimes with some kind of tank-tread for propulsion, and described either as leaving an empty tunnel behind it, or as filling the space behind it with mining debris.
17.
The levee system sealed the city off and has made additional city growth virtually impossible; as such the population has not increased much since their construction and Marysville is known as " California's Oldest'Little'City . " The hydraulic mining debris choked the Feather River and soon the riverboats could not make the trip to Marysville.
18.
It exercised jurisdiction over the Bureau of Mines, the establishment of mining schools and mining experimental stations, mineral land laws, the welfare of men working in mines, mining debris, relief in cases of mineral contracts connected with the prosecution of war, the mining of radium ore, and the Government's fuel yards in the District of Columbia.
