 
 <prompt> Which one get pass value, bitumen or sedimentary rock? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: "Naturally occurring crude asphalt/bitumen wey dey inside sedimentary rock na di main material wey dem dey use for petroleum production from "Oil sands", wey dey develop for Alberta, Canada. Canada get plenty natural asphalt/bitumen wey cover 140,000 square kilometres (wey pass England), and e make dem 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 dis one dey accessible for surface mining, although recent technological breakthroughs don make deeper deposits fit dey producible by in situ methods. Because of oil price wey increase after 2003, producing bitumen don dey highly profitable, but as oil price drop after 2014, e no dey economic to build new plants again. By 2014, Canadian crude asphalt/bitumen production dey 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 wey dey Alberta wey fit be extracted 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." 