Late on Sept. 6, 2005, a private plane carrying the Canadian mining financier Frank Giustra touched down in Almaty, a ruggedly picturesque city in southeast Kazakhstan. Several hundred miles to the west a fortune awaited: highly coveted deposits of uranium that could fuel nuclear reactors around the world. And Mr. Giustra was in hot pursuit of an exclusive deal to tap them....

...the two men were whisked off to share a sumptuous midnight banquet with Kazakhstan’s president, Nursultan A. Nazarbayev, whose 19-year stranglehold on the country has all but quashed political dissent. ...

...corporate records show that Mr. Giustra also came up a winner when his company signed preliminary agreements giving it the right to buy into three uranium projects controlled by Kazakhstan’s state-owned uranium agency, Kazatomprom...

...Just months after the Kazakh pact was finalized, Mr. Clinton’s charitable foundation received its own windfall: a $31.3 million donation from Mr. Giustra that had remained a secret until he acknowledged it last month. The gift, combined with Mr. Giustra’s more recent and public pledge to give the William J. Clinton Foundation an additional $100 million, secured Mr. Giustra a place in Mr. Clinton’s inner circle, an exclusive club of wealthy entrepreneurs in which friendship with the former president has its privileges.