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OF,Coto <br /> NQ' _ o DEPARTMENT OF NATURAL RESOURCES <br /> David Director MINED LAND RECLAMATION DIVISION <br /> * 1876 + DAVID C. SHELTON, Director <br /> Richard D.Lamm <br /> Governor <br /> DATE: October 21 , 1986 <br /> T0: Tom Schreiner��� <br /> FROM: Dan Mathews <br /> RE: COORS KEENESBURG VEGETATION DATA FILE C-028-81 <br /> Attached are data summaries from vegetation cover sampling conducted during <br /> September, 1986 at the Keenesburg Mine. <br /> The spring, 1985 seeded area was sampled along with the fenced referenced <br /> area. It will be several years before it can be determined if a successful <br /> stand dominated by warm season perennial grasses has become established, but <br /> this year's data (when compared to.the stand that develops over a number of <br /> years) should provide some insightAo the competitive interaction between the <br /> various cool and warm season short and tallgrasses. <br /> The 1978 cover depth test plots were also sampled. The data servo support <br /> previously noted observations including the fact that, for some reason, warm <br /> season tallgrasses established most successfully on the two foot depth sand <br /> over clay plot rather than the three foot plot which would have been <br /> expected. It is possible that different levels of compaction resulting from <br /> plot preparation work may have affected the result. A similar experiment was <br /> initiated in spring, 1986 on actual mine backfill . It will be important for <br /> Coors to closely monitor the newly established plot on an annual basis in <br /> order to record trends and to allow for reliable interpretation of observed <br /> results. <br /> Attachment(s) <br /> /iml <br /> 4622F <br /> I <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866.3567 <br />