Laserfiche WebLink
Non-Tributary Support: Cash Mine Borehole AdrianBrown <br />3.3 Non-Tributary Determination <br />The depletion of natural streams that would occur within 100 years computed using the Glover stream <br />depletion formula is 9.2 cubic feet per year (0.00014 acre feet per year), which comprises 0.0084% of <br />the average annual extracted flow. Accordingly, the Cash Mine dewatering water is non-tributary under <br />the definition of Section 37-90-103(10.5) C.R.S. <br />4. NON-TRIBUTARY MINE DEWATERING PERMIT <br />Section 37-90-137 (7) C.R.S of the statute provides additional requirements for the issuance of a non- <br />tributary mine dewatering permit. This section addresses these requirements. <br />4.1 Basis <br />Section 37-90-137 (7) C.R.S. states that: <br />"(7) In the case of dewatering of geologic formations by removing nontributary ground water to <br />facilitate or permit mining of minerals: <br />(a) No well permit shall be required unless the nontributary ground water being removed will be <br />beneficially used; and <br />(b) In the issuance of any well permit pursuant to this subsection (7), the provisions of subsection (4) of <br />this section shall not apply. The provisions of subsections (1), (2), and (3) of this section shall apply; <br />except that, in considering whether the permit shall issue, the requirement that the state engineer find <br />that there is unappropriated water available for withdrawal and the six-hundred-foot spacing <br />requirement in subsection (2) of this section shall not apply. The state engineer shall allow the rate of <br />withdrawal stated by the applicant to be necessary to dewater the mine; except that, if the state engineer <br />finds that the proposed dewatering will cause material injury to the vested water rights of others, the <br />applicant may propose, and the permit shall contain, terms and conditions which will prevent such <br />injury. The reduction of hydrostatic pressure level or water level alone does not constitute material <br />injury. <br />4.2 Water Use <br />MRV is applying for a water right for dewatering a mine with the water being applied for beneficial use <br />(industrial, for ore milling). The permit for this dewatering borehole for facilitation of mining of <br />minerals use falls under Section 37-90-137(7)(b) C.R.S. <br />4.3 Rate of Withdrawal <br />The rate of withdrawal for this permit shall be: <br />Average Annual Withdrawal Volume: 2.5 acre feet per year <br />Peak Annual Withdrawal Volume: 17 acre feet per year 21 <br />Average Withdrawal Rate when Pumping: 25 gpm <br />23 Based maximum flow that will prevent material injury (17 afy, Section 3.5 below), and the maximum annual now required to dewater <br />the mine (16.4 afy, Section 2.5.2 above). <br />1601A-20070125 11