 This study uses Google Earth Engine, GE, JavaScript API to map exposed mine areas in four benchmark years, 1990, 2000, 2010, and current year 2018, as part of the Canadian Air Pollutant Emissions Inventory API. A random forest classifier was trained using two separate datasets to produce classification results for the four benchmark years in a time series. The study confirms that overall the area of mines is growing in Canada, and GE proved to be an invaluable tool in mapping exposed mine waste areas. This article was authored by Mayra Fuentes, Karine Millard, and Emile Loring.