I climbed Mt. Lyell and Mt. Maclure in August 1988. We used crampons and ice axe to cross the Lyell Glacier. Lyell was a straightforward class 3 rock climb, once we got off the glacier. Maclure was an easy class 2 scramble. I don’t understand your interest in the Maclure Glacier. The Lyell Glacier is the bigger deal.