(ShareCast News) - Trans-Siberian Gold said production of silver and gold at its Asacha site rose in the first six months of 2015.The Russia-focused miner said refined gold production rose 8.59% year-on-year to 17,746 ounces, while refined silver production climbed 5.37% to 23,420 ounces.However, the London-listed company reported a 13.3% decline quarter-on-quarter in gold output, while silver production in the quarter fell 30% to 10,116 ounces compared with the previous three months.Gold dore production rose 15.5% year-on-year in the first half to 19,088 ounces, while silver dore production grew 16.3% to 22,003 ounces.Trans-Siberian shares were down 0.26% to 11.47p at 11:39 on Monday.