This week I had reason to go back and re-read three papers I co-authored in the early 1980s. It is surprising how far advanced we were then, and how little things have changed, or how little of what did has become standard practice. The first paper is at this link. Rick Call was the lead on the work we describe in this paper. He was a large buff man, with an enormous beard, a perpetual pipe, and a totally irreverent attitude towards authority. He sent Ned Larson and me to Texas, where we sweated through the heat to get the data. Then back to Tucson to do the calculations. I recently reconnected with Ned who is now in Las Vegas and the grandfather of sixteen grandchildren. He is still with the U.S. Department of Energy which he joined after working with me for five years on the UMTRA Project in Albuquerque. He is a great engineer, as was Rick. (more…)
Archive for the ‘Heap leach’ Category
Posted in acid mine drainage, brandy, British Columbia, Cyanide, Diamond, Heap leach, Mining history, Open Pit, People, Tailings, Waste Rock, tagged cannon mine, don moore, geochemistry, Greens Creek, kimberlite petrology, mt polley, ned larson, rick call, risk, UMTRA on February 13, 2015 | 9 Comments »
Had a chance today to look through the proceedings of the upcoming conference Heap Leach Solutions 2014 scheduled in Lima, Peru for November 10 through the 13th, 2014. The paper that caught my eye and caused me to stop and read it is titled Leach Pad Cost Benchmarking. The authors are Mark E. Smith and Denys Parra of Anddes Asociados SAC, Peru. Two famous folk in the field of heap leach pads. You will have to wait for the proceedings to be published to get a copy, but for now let me quote from the paper. Here is the paper abstract: (more…)
Posted in consulting, Geosynthetics, Geotechnical, Heap leach, Reclamation, Tailings, Waste Rock, tagged cover, erosion, geosynthetic, mine closure, Reclamation, rock cover, slope stability on July 2, 2014 | Leave a Comment »
The exterior surface of most tailings, waste rock, and heap leach facilities include:
- A top deck which is the flatter surface that forms the top surface of the facility. This is usually sloped at between one and five percent, primarily to promote runoff.
- The sideslopes which are easily covered if they are inclined at about five horizontal to one vertical (5H:1V) but which in practice may be as steep as 1.4H:1V.
Covers on the top deck are less subject to erosion, slope instability, and soil creep than covers on sideslopes. Thus different covers may be appropriate at the same facility on the top deck as compared to the sideslopes. Here are a few idle thoughts on sideslope covers for mine waste facilities. (more…)
Posted in drilling, Geotechnical, Heap leach, Human relations and mining, Jobs and Salaries, People, tagged education, Northwest Community College, school of exploration and mining on January 28, 2014 | 1 Comment »
Posted in About the news, British Columbia, Heap leach, Mining history, Reclamation, Tailings, Waste Rock, tagged Bidim, conference, geosynthetics mining solutions, InfoMine, tarik hadj-hamou, Vancouver on October 30, 2013 | Leave a Comment »
In addition to blogging, I consult to the mining industry. And I work with Andy Robertson who also owns InfoMine to promote conferences — something InfoMine has decided to undertake in a big way. A few months ago, Andy asked me what topic I thought would make for a good conference. A short reflection and I suggested geosynthetics in mining. Way back in 1974 or thereabouts, I became familiar with geosynthetics when i used Bidim to make the base of a tailings facility in South Africa. I became very familiar with geosynthetics about five years ago when Andy and I suggested geotextiles and geogrid placed on frozen tailings for the Suncor Pond 5 cover base. In between, I have designed geogrid reinforced slopes, built reinforced walls, placed covers and liners, and read about geosynthetics. (more…)
Posted in British Columbia, Enviromental, Geotechnical, Heap leach, Reclamation, Tailings, tagged antifragile, cold climate, cold regions, cover, cover system, fmea, mine closure, nassim taleb, risk assessment on October 15, 2013 | 1 Comment »
On the plane to the site I dipped into Nasim Taleb’s latest book, Antifragile. I read a few chapters and have stowed the book for the return fight. But I picked up enough to know that an antifragile system is one that thrives on change, shock, time, and other perturbing factors. An antifragile system is the opposite of a fragile system that inevitable breaks as a result of time, shock, disturbance, and the propagation of a mere crack. Antifragile system thrive on disorder; fragile systems do not. (more…)