Sentence 1: Starting in 1903 , copper was mined by the Nevada Consolidated Copper Company and by the Giroux Consolidated Mining Company in 1904 .
Sentence 2: In 1903 , copper was dismantled by the Giroux Consolidated Mining Company and by the Nevada Consolidated Copper Company in 1904 .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?