The government of Bolivia have prohibited the exportation of tin ores. There have been discovered, recently, in the neighborhood of La Paz, extensive deposits of coal, which ap pears to be of good quality. Another valuable silver mine has recently ' been opened at Copiapo, Chili. J The copper mines in the neighborhood of Santiago de Cuba, are described as very pro mising. A block of stone, taken from Braddock's Field, is about to be sent to the Washington National Monument, by James W. Buchanan, Esq., of Pittsburg. it is stated by the last news from Europe, that guano has been found on the Falkland Islands. This may lead to a reduction in its price, and a consequent benefit to the farmers both at home and abroad.