Factors affecting native species invasion were studied on a subalpine minesite (Smoky River Coal Limited No. 8 Mine) in the vicinity of Grande Cache, Alberta. The site had been revegetated with agronomic species in the early 1970s. Data collection involved cover estimations at 220 sampling locations predetermined by applying a 60 m interval grid pattern to a 1:3000 aerial photograph of the study site. Covariance analyses were conducted to identify variables significant in the native species invasion. Significant variables included coarse fragment content, distance from the nearest upwind seed source, alfalfa cover and slope. Ranking of independent variables indicated that coarse fragment content was the most important variable contributing to native species occurrence. Aspect and distance from the nearest upwind seed source ranked second.