In Yukon Company, you play a trader in Alaska who is buying goods at Dawson City and then taking them out to the prospectors at various creeks, and trying to make as much money as possible before the inevitable end of the gold rush.
Sometimes it's difficult for new players to remember which part of each playing card is important in the different phases of the game. I made these player aids (3 jpeg files, cut apart to make 6 companies). The mats tell players what to pay attention to in each phase and have a place to put the cards face down. I've found that these mats save a lot of time in the game.