The churn drill is a large drilling machine that bores large diameter holes in the ground. In mining, they were used to drill into the soft carbonate...

Look up churn or churning in Wiktionary, the free dictionary. Churn may refer to: Butter churn, device for churning butter Churning (butter), the process...

rock. The churn drill appears in Europe during the 12th century. In 1835 Isaac Singer is reported to have built a steam powered churn drill based on the...

1851, James Fowle received a patent for a rock drill powered by steam or compressed air. Churn drill Sullivan Machinery Company (1903). The Excavation...

1928–1930 when several short shafts were sunk and a churn drill was brought to the area to drill into the rich ores. That work was halted by the Great...

porphyry copper deposit at Bingham Canyon, Utah. Krumb further refined his churn drill sampling technique at William Boyce Thompson's Inspiration (Miami, Arizona)...

butter churning can be started. For this purpose a wooden churning-stick is used, which is rotated by moving a cord back and forth. By the drill movement...

during the ancient Chinese Han dynasty, when percussion drilling ("churn drilling") was used to extract natural gas in Sichuan province. Iron bits were...

main pit, was discovered in 1952 when Anaconda conducted an extensive churn drilling programme to explore for oxidised ore to the north of the Chuquicamata...

equipment that was used. When the mine started, drilling was done using the same Keystone churn drills that were used in the diversion project, the 1 1/2...