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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />i <br />r <br />r <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />i <br />COLORADO SCHOOL OF MINES RESEARCH INSTITUTE 3 <br />to soil be determined by the quantity available and by the quality of subsoil or <br />spoil; no benefits were evident when more than 76 to 102.cm of topsoil was <br />applied to spoil. <br />The above literature, and other published material not cited here, can be <br />summarized as follows: <br />1. Soil -depth requirements for reclamation vary from less than 30 cm <br />to over 90 cm. <br />2. Spoil quality is an important factor affecting soil -depth require- <br />ments. <br />3. Precipitation can exert a significant effect on soil -depth require- <br />ments. <br />4. Soil -depth requirements are modified by vegetation requirements, <br />especially with respect to annual and perennial species. <br />