Miming'near Oregon City.—A piece of gold weighing eleven ounces was taken from the claim of Messrs. Barton, Jones, and Meeks, at Xehtffc Flat near Oregon City, on Sunday Inst, also about six ounces of gold j J iii dust and specimens. There arc rich diggings rn ‘Oregon Oulch and vicinity, that would l»c devoloped was there an abundance of water.