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Archive for the ‘Engineering – General’ Category

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Another sad story of underfunded mine closure.  According to this report, Yukon Zinc owes the territorial government $3 million in environmental security.  Now the company is bankrupt and also owing $646 million to hundreds of creditors. The tailings management system is described in a report at this link.  The system is described thus: (more…)

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The Mining Association of Canada (MAC) has announced that they are convening a panel to ” review its tailings management requirements to ensure failures, such as the one registered at Imperial Metals’ Mount Polley open pit copper and gold mine, can be prevented.” (more…)

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Here is the link to the new report Lower Athabasca Region Tailings Management Framework for the Mineable Athabasca Oil Sands.  In some fifty pages it sets out a new way of dealings with oil sands tailings.  Lots of detail yet not much detail. The document sets itself these goals: (more…)

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There are so many obvious comments on this story, that I refrain from comment.  The story tells its own story and carries it own implications loud enough. I refer to the story at many links.  This one says: “Los Palambres was also hit this week by a court ruling that it should demolish a mine tailings dam which protesters say is affecting water availability.” Another report says: “As a consequence Los Pelambres must destroy part, or all, of the tailings dam wall.” A more complete picture emerges from this report: (more…)

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Last week I needed to brush up on stability analysis of waste rock dumps or embankments as they are sometimes called.  I went to the obvious sources: EduMine.  I opened the course Design  and Operation of Large Waste Dumps by Tim Eaton and Scott Broughton. In the section on Analysis they present a masterful description of the various failure modes and how to analyse them. They add this on probability of failure: (more…)

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UtilityDIVE reports at this link as follows:

Duke Energy reported its Q4 2014 earnings this week and company officials say it is preparing to pay a $100 million fine to settle the ongoing investigation into a coal ash spill into the Dan River in North Carolina.

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Flexible Evaporation Solutions

Walked around the exhibit hall at the Denver SME convention.  Chatted to old friends and met new people–and learnt of new products. Suddenly my mind was cast back to my days as a kid on the East Geduld Mine in South Africa where we grew up.  The area was arid; there were no natural water bodies within two-hundred miles.  One of our favorite places was the mine’s evaporation ponds.  On our rickety bicycles we would break through the flimsy security gate and spend hours around the ponds.  They were magic: a wonderland of color and water.  Better than those fountains at the Bellagio in Las Vegas. (more…)

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