Explaination of reference to context

The line is a little bit of irony. Twenty years later, Quatermain was laid low by a fever when he met another traveler, Jose Silvestre, who speaks briefly with Quatermain and bids him farewell, stating, “If we ever meet again, I shall be the richest man in the world, and I shall remember you.” A week later, having recovered from his fever, Quatermain is hunting with his companions when they come across a man nearly dead from exposure to the elements. This is none other than Jose Silvestre, whom Quatermain and his men nurse back to a modicum of health. Knowing he will die soon, Silvestre bequeaths his link to King Solomon's mines, a document written by his ancestor, Jose da Silvestra, detailing in obscure terms the location of the fabled mines.