Mountain City K.T., 9th Feb, clear manuscript postmark on neat 1861 cover to Massachusetts franked with 1857 3¢ dull red with manuscript cancel, Very Fine and scarce, mailed after Kansas statehood but before formation of Colorado Territory, ex-Persson. Scott No. 26  Estimate $1,500 - 2,000. By 1860, prospectors had proven the existence of profitable deposits of gold and settlement was rapidly fanning out westward into the mountains. Thirty miles to the west of Denver City, placer and lode mining on the headwaters of Clear Creek led to the establishment of post offices at Mountain City and Missouri City. $0 (Image)