|The following is based on Fallout New Vegas cut content and has not been confirmed by canon sources.|
Jack Wilson is getting paid to move mined limestone from Quarry Junction to the cement mixing station in Boulder City, however, the existing rubble in Boulder City could be used instead to save money. It seems the NCR have vetoed this as they consider the materials "unusable" (whether they are or not, or whether this is some kind of scam or simply NCR bureaucracy wasting money isn't clear). The quest concerns finding Wilson at Gomorrah, and then convincing him to do something - probably to use the rubble to speed up/save money on the rebuilding costs. It's unclear who would ask you to do this, but the information is said to be told to the player by the big Horn bartender Ike.
Jack Wilson is only mentioned in Fallout: New Vegas.