sentences:  Several states (e.g., Illinois, Indiana, Ohio, Pennsylvania) have placer gold deposits, despite having no hard rock gold deposits.This placer gold is found north of, or near the terminus of, Pleistocene, or earlier, moraines left by Ice Age glaciers that pushed gold-rich dirt down from Canada, where hard rock gold deposits do exist, and which were scoured by glaciers.Small commercial operations have existed at various times, to mine this gold, with various degrees of limited success.