The Very Steep Trail (aka Vault Mine Trail) in the Santa Rita Mountains south of Tucson is aptly named, but at least it’s short! You will gain 1500′ in elevation in less than 1 mile. From the top of this trail you can continue either to Agua Caliente Saddle, or connect to Josephine Saddle and return via the Old Baldy Trail.
Along the route is an adit of the Lead Prospect Mine. This mine operated in the early 1900’s and produced copper, lead and zinc. According to a 1915 USGS bulletin, ‘Curry Camp’ was located in a relatively flat spot past the adit. There were no permanent structures known to have been built here, but it probably supported the mining activities at the semi-open pit mine above the adit. The steepness of this canyon makes you appreciate (or wonder about the sanity of) early mining operations and the hardy workers.
The hike down is certainly quicker, or you can return via Josephine Saddle which is easier on the knees.
Reference: Hikers Guide to the Santa Rita Mountains by Betty Leavengood and Mike Liebert