The Far-Eastern Review; Engineering, Commerce, Finance Volume 3
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...other similar appliances an $8 ore concentrated 6 to 1 with a 60 per cent saving will make a $28.80 concentrate. If we take from this the cost of mining the extra five tons, concentration, etc., we get about an $18 ore rret. And this I believe will not be far from the lowest value that for some time to come it will pay to handle. Working Methods.--I advise using the topographic map of the district, shortly to be published by the Mining Bureau, as a base, continuing Mr. F.veland's survey to include Southeastern Suyoc, unfortunately not included by him. On this should be plotted every outcrop and ore occurrence in the entire district, with full data, Three months will complete this, during the engineer's spare time. Mancayan Mines.--Firstly a thorough examination should be made of the Mancayan ore occurrences and dumps. This may be completed in 30 days if the existing surveys are accurate, otherwise, it will take double that time at least. Diamond drilling has many advantages' chief amongst which is its speed. I doubt the advisability of going to the great expense this would incur here; owing to there being no contractors in the country it would be necessary to put a large capital into a plant for which at the best there would be only a short work and that a dead one which would have to be done all over again by shafts and tunnels. Again these are irregular deposits and the core from the drill might give a blank and yet be within a few feet of a rich ore occurrence which in a tunnel would be indicated by a seam and then sought. Again on the other hand the core might give us a very rich sample which on development we would find to be nothing but a little island lense of insufficient size to have warranted the double expenditure of both the...
- 189 x 246 x 24mm | 844g
- 13 Sep 2013
- Illustrations, black and white