1994-03-03_GENERAL DOCUMENTS - M1977378

Home Browse Search

-SENT BY:Sunnyside Gold CorP 03-03-94 10:07AM 3033875310-) 303 832 8106 # 2 stt Yssa G= OORPORATWX AX 80390 air CCMPAXT P.O. Box 177 -SIIveRon, CO 61433 Phone (303) 387-5533 •T81800Py (303) 387-5310 March 2, 1994 Allen Sorenson, Reclamation Specialist Department of Natural Resources Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE: File No. M77-378, TR-14 F-L Brenneman primary Bulkhead wall irregularity Dear Mr. Sorenson: The design assumption that enough perimeter area irregularity exists at each of the bulkhead sites to prevent bulkhead failure by thrust is to be confirmed prior to pouring of the bulkhead or a design for shear pins is to be submitted to the Division if the design assumption cannot be confirmed. Because of the relatively small irregularity (0. W) and quantity (19% of the perimeter area) of intact rock irregularities required, it would be very difficult to verify if a bulkhead site was marginal in respect to these design assumptions. The F-L Brenneman Primary Bulkhead site is not marginal. Attached are x-sections, long sections and plan sections to provide documentation to demonstrate that the design assumptions are valid. The following estimation of wall irregularity percentage is similar to that provided for the F-L Brenneman Secondary Bulkhead. The x-sections show varying x-sectional area (see Table 1) with the largest section being towards the center of the bulkhead. This area is larger because it is at the end of a round and was selected as the site for the air-side bulkhead because it provides a natural local low to further wedge the bulkhead against thrust. The bottom of a round in the sill is not as pronounced in this bulkhead but' is still adequate for anchoring against thrust. TABLE 1 SECTION X-Sectional Area (9g. ft. ) Comment 0 + 14.5 64. 10 Water-side 0 + 15.6 66.43 0 + 17.6 63. 90 0 + 18.6 65. 96 0 + 19.6 71.00 0 + 20. 7 65. 58 0 + 22.5 65.04 Air-side R