The central shaft reached a depth of 2980 feet and a south shaft was sunk in 1928 to reach a depth of 3600 feet .
The central shaft reached a depth of 2980 feet , and a southern shaft was dumped in 1928 to reach a depth of 3600 feet .
The central shaft reached a depth of 2980 feet , and a southern shaft was dumped in 1928 to reach a depth of 3600 feet .
문장을 의역 버전으로 작성하세요: The central shaft reached a depth of 2980 feet and a south shaft was sunk in 1928 to reach a depth of 3600 feet . 산출: