EXHIBIT 10.11 ROYALTY/REVENUE INTEREST SALE AGREEMENT NIGERIAN OIL CONCESSION BLOCK 469 THIS AGREEMENT made and entered into this 31st day of March, 1997: BETWEEN: YINKA FOLAWIYO PETROLEUM COMPANY LIMITED, a corporation incorporated pursuant to the...Revenue Interest Sale Agreement • March 26th, 1999 • Abacan Resource Corp • Crude petroleum & natural gas
