|
I 28.27:6356
|
Method and cost of quarrying limestone at the Speed quarry of the Louisville Cement Co., Speed, Indiana |
1 |
|
I 28.27:6357
|
Methods and costs of treatment at the Calumet & Hecla reclamation plant |
1 |
|
I 28.27:6358
|
Milling methods and costs at the Nacozari concentrator of the Phelps Dodge Corporation, Nacozari, Sonora, Mexico |
1 |
|
I 28.27:6359
|
Milling methods and costs at the Black Hawk concentrator, Hanover, New Mexico |
1 |
|
I 28.27:6360
|
Mining methods and costs at Tintic Standard mine, Tintic District, Utah |
1 |
|
I 28.27:6361
|
Mining and engineering methods and costs of the Hanover Bessemer Iron & Copper Co., Fierro, N. Mexico |
1 |
|
I 28.27:6364
|
Milling method and cost at the conglomerate mill of the Calumet & Hecla Consolidated Copper Co |
1 |
|
I 28.27:6365
|
Titanium |
1 |
|
I 28.27:6368
|
Mining practice at the Pecos mine of the American Metal Co. of New Mexico |
1 |
|
I 28.27:6369
|
Mining methods and costs at the Montreal Mine, Montreal, Wis |
1 |
|
I 28.27:6370
|
Methods of mining at the Black Rock Mine, Butte & Superior Mining Co., Butte District, Mont |
1 |
|
I 28.27:6371
|
Mining methods and costs of the Silver King Coalition Mines Co., Park City, Utah |
1 |
|
I 28.27:6372
|
Mining methods at the Page mine of the Federal Mining and Smelting Co., Page, Idaho |
1 |
|
I 28.27:6376
|
Method of mining a thick coal bed in eastern Utah |
1 |
|
I 28.27:6377
|
Mining methods and costs at the Ground Hog Unit, Asarco Mining Co., Vanadium, New Mexico |
1 |
|
I 28.27:6378
|
Shaft sinking at the Sevier Valley Coal Co. mine |
1 |
|
I 28.27:6379
|
Milling methods of the American Zinc Co. of Tennessee, Mascot, Tenn |
1 |
|
I 28.27:6380
|
Mining practices, methods, and costs at mine no. 5 of the Marquette Range, Michigan |
1 |
|
I 28.27:6381
|
Feldspar |
1 |
|
I 28.27:6382
|
Mine ventilation in the Coeur d'Alene mining district |
1 |