The Mineral Evolution database is currently under development.
The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.
This mineral is using an age reported as an element mineralization period.
O
This mineral is using an age calculated from all data at the locality.
R
The age displayed for this mineral originates from a different, non-child locality.
P
The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.
This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.Elements at this locality, including sub-localities: AgAlAsAuBaCCaCuFeHKMnMoOPPbSSbSiUZnElements from minerals reported directly at this locality: Structural Groups for minerals in this locality:
Boulder batholith in western Montana extends from a few miles south of Helena to about 20 miles south of Butte. The northern part of the hatholith includes most of the batholith north of the latitude of Boulder and a narrow strip near the east margin of the batholith south of Boulder. This area lies between the Elkhorn mountains on the east and the rather broad, high-level surface making up the Continental Divide on the west. Although the area is mountainous, the topography is not rugged but is characterized by smoothly rounded ridges commonlya bout 1,000 feet above the major valleys. Most of the higher valleys were occupied by glaciers in the Pleistocene epoch, but typical alpine cirques are rare. The localities listed here are the Uranium deposits found within the Boulder Batholith.
The age for the Uranium deposits of the Boulder Batholith are described as being post-Alaskite of 60 Ma and pre-Dacite, which is described as being early Oligocene by one of the author's references up to Miocene by another.
Sample
Source Locality
Reference URL
All locality data graciously provided by mindat.org