In 1946 Calgary geologist and mining expert Frank M. W. Henderson returned from the valley reporting his partner Jack Patterson had disappeared. Henderson and Patterson had agreed to meet at a point near Virginia Falls. The first to arrive would leave a message on a large tree which both knew from previous trips. Henderson arrived first and left his message before traveling into the valley. He returned several weeks later only to find there was still no message left by Patterson. Henderson and his party camped there a few days, but one night were awoken by a group of First Nations people who warned of white figures moving along the valley.