Is the pitch lake inexhaustible?

The pitch lake is not inexhaustible. It is thought to be inexhaustible because occasionally, organic matter, which previously was not there, would appear at the surface, fuelling the thought that it came from below and with it, a replenished amount of TLA. Secondly, its miraculous consistency from place to place on its surface, and over the hundreds of years of use, suggests that it has homogenized by constant motion. Thirdly, quantity surveys are conducted from time to time and, despite its rate of extract, its residue is often slightly more than that which the survey suggests that it should be.