Laserfiche WebLink
<br />• Leach Potential Test <br />Schwartzwalder Waste Rock <br />Waste Sample <br />Collect two samples from the waste dump, approximately 50~ mine develop- <br />ment rock and approximately 50% ore sorter reject (from the dump), <br />This rock should be free of fines and thoroughly mixed before dep~~siting <br />it in each of two plastic 55 gallon drums. (Each drum will have .j sample <br />cock at its bottom.) <br />Two leach potential tests will be conducted to evaluate: (1) the "worst <br />case" conditions assuming waste rock falls into the creek and is riot <br />recovered (saturated, flowing conditions); and (2) conditions resulting <br />from frequent non-saturated exposure to a volume of water equivalent <br />to the annual precipitation at the site with a pH equal to front range <br />values. <br />Sample Collection and Preparation <br />• Using two fifty-gallon plastic containers, with a spigot on the bottom <br />of each container, fill each container with an equivalent volume of rock <br />with an average grade of about 0.03°J U30g, as determined by T-probe. <br />(Verify by assaying a composite sample from each container.) <br />The sample must be representative of waste rock fragment size. DO NOT <br />CRUSH. The average grade and fragment size will tend to be more repre- <br />sentative of ore sorter reject because run-of-mine development waste <br />("bone rock") is -12" and ore sorter reject is +2" through -6" and <br />+1" through -2". Large development waste rock fragments should not be <br />used. After collecting the rock samples, cover each container with a <br />lid, and, after collecting 50 gallons of creek water in a separate <br />container, transport to Canon City. <br />Test Procedures - Test No. 1 - Saturated Flowing Conditions <br />Set up the container to be used for test no. 1 so that, after washing <br />the rock, the container is filled with the creek water, insuring that <br />all rock fragments are below the surface of the water. Cover the c~mtainer. <br />Put the spigot of the container with the waste rock above the covered con- <br />tainer with the remainder of the creek water. Open the spigot on tfie <br />waste rock container and adjust flow to coincide with flow of pumps <br />draining water from creek water container. Water from creek water c:on- <br />• tainer should be circulated, using Tygon tubing, to the top of the <br />covered waste rock container. <br />a <br />