"At the Paris Exhibition of 1867 much interest was aroused by Leschot's invention for cutting through hard rock by diamonds in rapid rotation. Originally intended for use on a small scale, this method was soon applied by Major Beaumont and others to deep boring; and the great improvements made of recent years in the construction of the instruments used, and the large amount of experience that has been gained by their general use in mining districts, have added so much to the importance of the subject of boring, that it is no longer possible to deal with it adequately in a chapter of a general treatise on mining. An independent work is needed. In German, this exists in Tecklenburg's monumental work. In English, however, Mr. Denny's handbook is the first to give a detailed account of the use of modern diamond core-drills in searching for mineral deposits. The work, which covers 158 pages, contains much information of a practical character, including particulars of the cost of apparatus and of working. It is, unfortunately, limited in its scope. South African conditions are alone considered, and the descriptions of the drills are confined to machines made by two American firms. The numerous well-designed drills of English and Continental make are not mentioned. The work cannot, however, fail to be of value to any one contemplating using diamond-drilling machines for the examination of mineral lands in South Africa." (B., B. - Diamond Drilling for Gold and other Minerals; Nature 62, 435 (1900) - https://doi.org/10.1038/062435b0)
"Diamond drilling on the Witwatersrand is almost universally done by contract, the reason being that men with the special knowledge required are not easily available, and that a Mining Company seldom has sufficient work to justify the outlay upon the plant; and, moreover, the saving that would be effected by the Company, as against the contractor's figure, is not sufficient to warrant the establishment of this separate department." (Diamond Drilling for Gold and other Minerals, page 99)
This is an extremely rare copy of this precious work, hard to find even in National and University Libraries - and the only copy selling on internet.
Red cloth harcovers; Text in English; Collation complete – Frontispiece, Title page, [x], 158 pages, [64], including numerous illustrations, tables and diagrams; Binding is strong, tight and firm, corners and spine extremities with minor bumping, spine extremities with a small incipient creases. Hinges partly with a few incipient crackings, but strong and whole. Content/text block clear and very bright, only frontispiece, title page and first page with a small foxing dot to the blank on the right, otherwise no foxing or markings throughout, slight age tanning. A sound copy.
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- Binding Condition: Very good
- Overall Condition: Very good
- Size: 23 x 15 cm
