Mount Lyall is the largest agates mine in North America. The mine is in a 350 million years old volcano, situated in the hearth of Gaspesia. Our company is a geode and semi-precious stone supplier. And during the summer period, we are open to public of all ages for a rock hunting activity. The mineral deposit is estimate at three century. Geodes size vary fron 1 inch to 3 feets, protected in the kaolin clay.