While at the tree climb "Cedar on the Hill", when I reached the cache and opened the container, I removed 2 coins in clear envelopes while looking for the log to sign. This coins clear envelope was torn so that 2 sides was open and it slipped out and fell to the ground. I was 70 feet up the tree and was able to see the area where it fell. When I returned to ground level I spent 30 minutes looking for it but did not find. I know it was a gold coin and I saw the bushes it hit before it would have hit the ground. I will return with a flashlight and hope to be able to find it. I am sorry this has happened.