That's really all we've got.
I take that last line back. This is from Lostpedia ...
According to an auctioneer selling the ship's first mate's journal, the Black Rock set sail from Portsmouth, England on March 22, 1845, purportedly on a trading mission to the Kingdom of Siam (now known as Thailand). The ship was believed to have been lost at sea. Seven years later, the journal was discovered among the artifacts of pirates on Île Sainte-Marie, an island off the coast of Madagascar. This journal is believed to be the only surviving remnant of the Black Rock's ill-fated final voyage, and was sold at a Southfield's auction to Charles Widmore. The ledger had previously been possessed and read solely by the Hanso family, but was put forward for sale by Tovard Hanso. ("The Constant")










