Vic, your link to the announcement is broken. I found the following verbiage on the new NM.
"This monument will protect approximately 704,000 acres of public land in of one the most undisturbed corners of the broader Great Basin region. Less than two hours from Las Vegas, this unbroken expanse attracts recreationists seeking vastness and solitude and provides significant wildlife habitat and migration corridors. The area tells the story of a rich cultural tradition, from the earliest human inhabitants 13,000 years ago to miners and ranchers in the past century. The monument features an array of cultural sites, including petroglyph and prehistoric rock art panels, and offers exemplary opportunities to further study and understand this unique landscape and its human inhabitants. The area is also home to City, one of the most ambitious examples of the distinctively American land-art movement. Located on privately-held land in Garden Valley, the work by artist Michael Heizer combines modern abstract architecture and engineering with ancient American aesthetic influences. The monument also allows for the continuation of certain historic uses, including livestock grazing and military use. Local private landowners, local elected officials, art institutions, conservation and recreation organizations, and representatives from major Nevadan and national businesses have supported protecting the area. The site will be managed by the Bureau of Land Management."
The area included is north of Alamo, NV. Google "Garden Valley, NV" to get a general idea of the area. I am sure that a state atlas will have more detailed information on how to get into the area. It sounds like a wonderful place to visit.