Documents

The Rangeland Administration System (RAS) provides grazing administrative support and management reports for the BLM and the public. The Rangeland Administration system serves as an electronic calendar for issuance of approximately 18,000 applications and 2,400 grazing authorizations (Permits, Leases, and Exchange-of-Use Agreements) per year, eliminating the need for manually processing these forms.

Phase I Environmental Site Assessment (ESA) for an approximately 60.4-hectare (149.3-acre) site in Maricopa County, Arizona (6L Ranch).

This technical memorandum was prepared to summarize results of drilling, construction, equipping, and testing at hydrologic test wells HRES-10 and HRES-11. The wells were installed to characterize hydrogeologic conditions in the Apache Leap Tuff (Tal) in the southeast extent of the Tal outcrop area near Mineral Creek. Monitoring data obtained from HRES-10 and HRES-11 will be incorporated into the RCM hydrologic monitoring program.

This test method covers a procedure that accelerates the natural weathering rate of a solid material sample so that diagnostic weathering products can be produced, collected, and quantified. Soluble weathering products are mobilized by a fixed-volume aqueous leach that is performed, collected, and analyzed weekly. When conducted in accordance with the following protocol, this laboratory test method has accelerated metal-mine waste-rock weathering rates by at least an order of magnitude greater than observed field rates.

Environmental issues have become important, if not critical, factors in the success of proposed mining projects worldwide. In an ongoing and intense public debate about mining and its perceived environmental impacts, the mining industry points out that there are many examples of environmentally responsible mining currently being carried out.

This report summarizes the meteorological, upper air, nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and particulate matter (PM) data collected at the Resolution Copper Project near Superior, Arizona for the first quarter, January 1 – March 31, 2016.

We present a new empirical ground motion model for PGA, PGV, PGD and 5% damped linear elastic response spectra for periods ranging from 0.01–10 s. The model was developed as part of the PEER Next Generation Attenuation (NGA) project. We used a subset of the PEER NGA database for which we excluded recordings and earthquakes that were believed to be inappropriate for estimating free-field ground motions from shallow earthquake mainshocks in active tectonic regimes.

This paper compares a number of approximations used to estimate means and variances of continuous random variables and/ or to serve as substitutes for the probability distributions of such variables, with particular emphasis on three-point approximations.

We present tectonic reconstructions and an accompanying animation of deformation across the North America–Pacific plate boundary since 36 Ma.