In 1905, a massive accidental explosion of nitroglycerin killed 23 workers. The explosion carved a massive crater in the north flank of the hill, which is today evident by a large dip in the tree-line. After this incident, dynamite making was forced north to less-settled areas, making an eventual last stand at Pt. Pinole, now a regional park. Quarrying on the hill continued for many years, leaving scars on the rock and eventually obliterating a low summit northwest of Albany Hill, approximately where Richmond's Pacific East Mall is now located.