Laserfiche WebLink
three-pronged approach as follows; 1) potentially toxic/acid bearing materials at the Ruby Trust <br />are typically associated with the 'economic mined materials' and will therefore be ultimately <br />removed from the site; only'subgrade' (uneconomic) materials will remain which will have <br />undergone the milling process and have had considerable amounts of metal (typically identified <br />as the toxic components of concern) removed as a result. 2) economic 'ore' will be managed (as <br />the existing permit describes) in a manner to control toxic element releases. Ore is temporarily <br />stored on the concrete pad areas where it is then either bagged or loaded onto trucks removing <br />to material to the off-site extraction contractor. 3) In order to appropriately manage/identify the <br />economic vs un-economic and potentially the toxic vs non-toxic portions of the mined materials, <br />an additional suite of solids monitoring will be accomplished by the Ruby Trust staff. In addition <br />to the bulk samples collected for economic ore analysis, duplicate fractions will be collected for <br />SPLP/TCLP analysis coupled with ABA parameters (refer to Attachment C.1 for a thorough <br />description of these analysis suites). Results will be actively supplied to DRMS and interpreted <br />by the Mount Sneffel's permit manager. Materials will be assumed to be potentially toxic and <br />managed in a conservative manner regardless (please refer to Section 2 within this Exhibit for a <br />comprehensive description). The results of the analysis serve to verify the presence/absence of <br />acid- and toxic- forming materials on a real-time basis at the mine. The rate at which tests are <br />completed will be based on the rate of mining activity. <br />1) Measures taken to minimize disturbance to hydrologic balance to prevent off-site damage = <br />Currently the hydrologic balance is held in by active water management practices accomplished <br />at the mine which are checked by the adherence to their CDPS and Stormwater permits. Both <br />permits require maintenance, reporting and compliance to assure no release of point or <br />nonpoint pollutants to waters of the State of Colorado. Results from the CDPS permit are <br />actively reviewed by CDPHE on a quarterly basis to determine if permit conditions are in <br />compliance. The CDPS permit captures the potential impacts associated with mine-produced <br />water when released to Sneffels Creek. The mine produced water is groundwater captured by <br />the mine workings. The Stormwater Permit (COR-040245) describes the ongoing management <br />practices accomplished by the mine to control nonpoint pollution potentially created as a result <br />of stormwater contact. <br />The potential future hydrologic balance will be held by the following practices to be put in place <br />at the mine; 1) the proposed subgrade repository will be an historic 'crosscut' (by definition a <br />crosscut does NOT contact mineable material but only serves to create an access to mineable <br />material therefore this feature does not traverse a geologic setting that would contribute acid- <br />or toxic-forming substances) that occurs approximately over 100 ft above the static water level <br />within workings (refer to Section 2 below) that contain little to no ambient moisture. 2) the <br />repository will be comprised of a bulk-head and partial geotextile liner enabling the capture of <br />decanted water to be recycled into the ball mill thereby eliminating a large portion of potential <br />leachate water from the subgrade ore. 3) any leachate water created from the repository would <br />9