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

Carbonate

In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, . The name may also mean an ester of carbonic acid, an organic compound containing the carbonate group C2....

 rocks of lead

Lead

Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...

 and zinc

Zinc

Zinc , or spelter , is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because its ion is of similar size and its only common oxidation state is +2...

 hosted regions to extract bulk samples of the ore. They were common in the Tri-State

Tri-State

Tri-State may refer to:*Tri-State Airport, a public airport located in West Virginia, USA*Tri-state area, an area where three states meet at one point*Tri-State Christian Television, a network of several religious TV stations...

 areas during the lead and zinc mining in Missouri

Missouri

Missouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...

, Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

, and Kansas

Kansas

Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...

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There is an example of one of these machines at the Northern Life Museum

Northern Life Museum (Fort Smith, NWT)

The Northern Life Museum is in Fort Smith Northwest Territories, Canada. The museum has a collection of over 12,000 artifacts representing the peoples and history of the North. Many of the artifacts were collected by the Oblate Fathers and the Grey Nuns during their missionary work in the...

 in Fort Smith, Northwest Territories

Fort Smith, Northwest Territories

Fort Smith is a town in the South Slave Region of the Northwest Territories, Canada. It is located in the southeastern portion of the Northwest Territories, on the Slave River and adjacent to the NWT/Alberta border.-History:Fort Smith's history began because of the Slave River and the vital link...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. It was used in 1929-1930 at the Pine Point

Pine Point Mine

The Pine Point Mine is located west of Fort Resolution, Northwest Territories and east of Hay River, Northwest Territories, on the south shore of Great Slave Lake, Northwest Territories. Pine Point was a Mississippi Valley type deposit. It produced lead and zinc ores from 1964 to 1988...

 lead and zinc mine in the Northwest Territories

Northwest Territories

The Northwest Territories is a federal territory of Canada.Located in northern Canada, the territory borders Canada's two other territories, Yukon to the west and Nunavut to the east, and three provinces: British Columbia to the southwest, and Alberta and Saskatchewan to the south...

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