Fracturing hard rock with nuclear explosives and extraction of ore by a modified block-caving method

by Hardwick, W. R.
Published: U.S. Dept. of Interior, Bureau of Mines, 1970

Block-caving mining methods and costs Bagdad Mine, Bagdad Copper Corp. Yavapai County, Ariz

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1959

Open-pit copper mining methods, Morenci Branch, Phelps Dodge Corp., Greenlee County, Ariz

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1959

Open-pit copper mining methods and costs at the Bagdad Mine, Bagdad Copper Corp., Yavapai County, Ariz

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1959

Fracturing a deposit with nuclear explosives and recovering copper by the in-situ leaching method

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1967

Mining methods and practices at the Johnson Camp Copper-Zinc Mine, Coronado Copper & Zinc Co., Cochise County, Arizona

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1957

Mining methods and costs, Inspiration Consolidated Copper Co., Open-pit mine, Gila County, Ariz

by Hardwick, W. R.
Published: Bureau of Mines, 1963

Open-pit copper mining and concentrating methods and costs, Silver Bell Unit, American Smelting and Refining Co., Pima County, Ariz

by Hardwick, W. R.
Published: U.S. Bureau of Mines, 1963

Open-pit copper mining methods at New Cornelia Branch, Phelps Dodge Corp., Pima County, Ariz

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1960

Open-pit copper mining methods and practices, Copper Cities Division, Miami Copper Co., Gila County, Ariz

by Hardwick, W. R.
Published: U.S. Bureau of Mines, 1963

Open-pit mining methods and practices at the Chino Mines Division, Kennecott Copper Corp., Grant County, N. Mex

by Hardwick, W. R.
Published: U.S. Bureau of Mines, 1958

Block-caving copper mining methods and costs at the Miami mine, Miami Copper Company, Gila County, Ariz

by Hardwick, W. R.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1965