During the 1920s Dr. Karl A. Clark of the Alberta Research Council patented a hot water oil separation process and entrepreneur Robert C. Fitzsimmons built the Bitumount oil separation plant, which between 1925 and 1958 produced up to  per day of bitumen using Dr. Clark's method.
dˈʊɹɹɪŋ ðə nˈaɪntiːnhˈʌndɹɪd twˈɛnti z dˈɑːktɚ. kˈɑːɹl ˈeɪ. klˈɑːɹk ʌvðɪ ælbˈɜːɾɚ ɹᵻsˈɜːtʃ kˈaʊnsəl pˈæʔn̩ɾᵻd ɐ hˈɑːt wˈɔːɾɚɹ ˈɔɪl sˌɛpɚɹˈeɪʃən pɹˈɑːsɛs ænd ˌɑːntɹɪpɹənˈʊɹ ɹˈɑːbɚt sˈiː. fɪtssˈɪmənz bˈɪlt ðə baɪtˈuːmaʊnt ˈɔɪl sˌɛpɚɹˈeɪʃən plˈænt, wˌɪtʃ bᵻtwˌiːn nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈaɪv ænd nˈaɪntiːnhˈʌndɹɪd fˈɪfti ˈeɪt pɹədˈuːst ˌʌp tə pɜː dˈeɪ ʌv bɪtˈuːmɛn jˈuːzɪŋ dˈɑːktɚ. klˈɑːɹks mˈɛθəd.