00000nam 2200000za 4500 9.865038 CaOODSP 20221107161713 cr ||||||||||| 181121s1977 onc #ot f|0| 0 eng d 0660009846 CaOODSP eng eng fre n-cn--- M38-13/76-27E-PDF M38-13/76-27 Seegmiller, Ben L. A case history of support at Nacimiento mine [electronic resource] / by Ben L. Seegmiller. [Ottawa] : Energy, Mines and Resources Canada, c1977. x, 52 p. : figures. CANMET report ; 76-27E Includes bibliographic references. "The Nacimiento copper mine has experienced stability problems that threatened to prevent further mining. The nature of the rock material and the type of slides that occurred indicated that it should be possible to stabilize the slope by means of rock anchors, and in 1974 a major support installation was begun. Several hundred rock anchors with capacities up to 200 tons were subsequently installed. These were effective in stabilizing the slope initially, but shortly after, a number of anchors failed through stress corrosion. Although precautions were taken to prevent further anchor failures, those which remained were inadequate to bear the entire burden and a substantial slide did occur. The case history does show that a slope was effectively stabilized by rock anchors, and that when the supporting force was reduced by corrosion the slope again became unstable"--Abstract, p. iii. Includes abstract in French. gccst Mining technology Canada. Energy, Mines and Resources Canada. CANMET report ; 76-27E. (CaOODSP)9.852792 PDF 2.96 MB https://publications.gc.ca/collections/collection_2018/rncan-nrcan/m38-13/M38-13-76-27-eng.pdf