In 1827, Cancrin wrote Alexander von Humboldt, the famous Prussian scientist, asking if he would visit Russia at the monarchy's expense to identify areas where Russia could develop economically. Although Russia had played a major role in defeating the armies of Napoleon, in the postwar period Russia's position in the world had not risen and potentially Humboldt's visit could identify mining areas to exploit. The Russian government had already invited experts in mining from Germany and France for this task, perhaps not surprising since Cancrin's father, a mining expert himself, had come to Russia for similar reasons. From April to December 1829, Humboldt traveled through Russia, reaching the Chinese border in the east and the Caspian Sea in the south, before returning to St Petersburg. Cancrin had taken pains to guarantee the success of Humboldt's trip, arranging for his expenses to be paid as well as assuring the cooperation of Russian officialdom. "I shall not fail to send instructions to all governors and mining officials, with orders to put you up. Customs will be instructed to facilitate your entry into Russia." Humboldt accurately predicted that diamonds would be found in the Ural Mountains. Cancrin had initially contacted Humboldt to get his opinion about the feasibility of using Russian platinum in coinage. Humboldt recommended against it.