BUZZ-Sirius Minerals: Market cheers step ahead in Yorkshire project
** Shares in Sirius Minerals jumps as much as 10 pct after co says it has upgraded its take or pay supply agreement with its existing Fortune 500 US-based agri-business customer
** Top percentage gainer on FTSE Intl-AIM 100 Index
** Move comes soon post the potash miner winning approval to build UK's largest operating mine in Yorkshire
** "Announcement a major step forward in Sirius' marketing campaign and further de-risks York Potash Project from a market/pricing perspective," Liberum analysts say
** Including today's gains, co's shares have risen nearly 22 pct since it won the approval for the project
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