Ore Mining Methods Comprising Descriptions of Methods of Support in Extraction
Ore Mining Methods Comprising Descriptions of Methods of Support in Extraction
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This is done by steam shovels, the barren material being loaded into railroad cars or other cars of several tons' capacity. When removed by small cars they are usually transferred to the waste-bank by an engine plane or some form of rope haulage. An overburden ranging up to 40 ft. Or more in thickness is not uncommon, and while greater thicknesses might be removed without reaching a prohibitive figure from the standpoint of costs, yet it means that the underlying body of ore must be both thick ...and of high grade. The thickness of cover considered permissible to remove depends largely upon its character, i. E. , if soft or easily broken the maximum economic thickness may be taken, while hard stratified formations may reduce the thickness to a few feet and may even preclude the employment of surface methods alto- gether. The iron deposits of the Lake Superior region are covered with glacial drift which is easily and cheaply re- moved; considerable thicknesses extending over many acres are systematically stripped off and hauled from the site of the mine.
What to read after Ore Mining Methods Comprising Descriptions of Methods of Support in Extraction?
You can find similar books in the "Read Also" column, or choose other free books by Walter R Walter Richard Crane to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This is done by steam shovels, the barren material being loaded into railroad cars or other cars of several tons' capacity. When removed by small cars they are usually transferred to the waste-bank by an engine plane or some form of rope haulage. An overburden ranging up to 40 ft. Or more in thickness is not uncommon, and while greater thicknesses might be removed without reaching a prohibitive figure from the standpoint of costs, yet it means that the underlying body of ore must be both thick ...and of high grade. The thickness of cover considered permissible to remove depends largely upon its character, i. E. , if soft or easily broken the maximum economic thickness may be taken, while hard stratified formations may reduce the thickness to a few feet and may even preclude the employment of surface methods alto- gether. The iron deposits of the Lake Superior region are covered with glacial drift which is easily and cheaply re- moved; considerable thicknesses extending over many acres are systematically stripped off and hauled from the site of the mine.
What to read after Ore Mining Methods Comprising Descriptions of Methods of Support in Extraction?
You can find similar books in the "Read Also" column, or choose other free books by Walter R Walter Richard Crane to read onlineMoreLess
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