 ... some of them are exposed on three sides only, than on many blocks opened up on four sides in veins where the ore-bodies are of the bunch'y and erratic type which we must recognize to be, after all. by far the most frequently encountered? Even the...  Mining Without Timber - Page 295by Robert Bruce Brinsmade - 1911 - 309 pagesFull view - About this book
 | Thomas Arthur Rickard - Mine examination - 1907 - 244 pages
...recognize to be, after all. by far the most frequently encountered? Even the "possible ore" of Fig. 1 — ground where the ore is proved to exist on one side...of evidence to be required when making estimates of ore-tonnage, and the number and nature of classes into which estimates should be divided, must depend... | |
 | Thomas Arthur Rickard - Mine estimation - 1903 - 232 pages
...recognize to be, after all, by far the most frequently encountered? Even the "possible ore" of Fig. 1 — ground where the ore is proved to exist on one side...of evidence to be required when making estimates of ore-tonnage, and the number and nature of classes into which estimates should be divided, must depend... | |
 | Thomas Arthur Rickard - Mine examination - 1903 - 234 pages
...recognize to be, after all, by far the most frequently encountered? Even the "possible ore" of Fig. i — ground where the ore is proved to exist on one side...of evidence to be required when making estimates of ore-tonnage, and the number and nature of classes into which estimates should be divided, must depend... | |
 | 1908 - 712 pages
...recognize to be, after all, by far the most frequently encountered? Even the "possible ore" of Fig. 1 — ground where the ore is proved to exist on one side...greater extent than usual. " My contention is that tlie amount of evidence to be required when mak'ng estimates of ore tonnage, and the number and nature... | |
 | Thomas Arthur Rickard - Mine examination - 1903 - 238 pages
...Even the "possible ore" of Fig. 1—ground where the ore is proved to exist on one side only—can be depended on to a far greater extent than usual....of evidence to be required when making estimates of ore-tonnage, and the number and nature of classes into which estimates should be divided, must depend... | |
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