 
 <prompt> E hard pass to mine the surface or deeper deposits? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: Naturally occurring crude asphalt/bitumen wey dey inside sedimentary rock na di main feed stock for petroleum production from "Oil sands", wey dey develop for Alberta, Canada. Canada get plenty natural asphalt/bitumen pass any other country, wey cover 140,000 square kilometres (wey pass England), wey make am get di second-largest proven oil reserves for di world. Di Athabasca oil sands na di biggest asphalt/bitumen deposit for Canada and na only am dey accessible for surface mining, although recent technological breakthroughs don make deeper deposits fit produce by in situ methods. Because of oil price wey increase after 2003, producing bitumen don dey highly profitable, but as result of di decline after 2014 e no dey economic to build new plants again. By 2014, Canadian crude asphalt/bitumen production average about 2.3 million barrels (370,000 m3) per day and dem project say e go rise to 4.4 million barrels (700,000 m3) per day by 2020. Di total amount of crude asphalt/bitumen for Alberta wey fit extract dey estimated to be about 310 billion barrels (50×10^9 m3), wey at di rate of 4,400,000 barrels per day (700,000 m3/d) go fit last about 200 years. 