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Guest Comment: More hard facts about Rosemont mine

By Fred Tahse, CNW Homeowner Lot 29

Published: Saturday, May 3, 2008 11:14 PM MDT

Augusta Resource, the Canadian company that wants to develop a copper deposit in the Rosemont Valley of the northeastern Santa Rita Mountains, has stated recently that it may explore and possibly mine on the northwestern side of the mountains as well.

This would have a huge effect on Green Valley, Quail Creek, Sahuarita and Corona de Tucson.

In view of the depressing and harmful effects caused by the existing copper mines at Green Valley and Sahuarita, people from these communities deserve to know some facts* about the Rosemont mine:

How it came about

Whether or not it is the large mine Augusta claims it is

What it could do to the environment all Arizonans treasure

What huge amounts of our forestland could be lost forever

The Rosemont copper deposit is located within the old Helvetia mining district, once the site of several small underground mines. Since these mines closed down in 1951, the district has experienced exploration efforts by some of the largest mining companies in the United States—Banner Mining Co., American Exploration and Mining Co., Anaconda Mining Co., Anamax Mining Co., and ASARCO.

These companies have drilled hundreds of exploration holes throughout the district and made several boisterous estimates of copper resources. None of them attempted a mine in this area. Augusta, too, launched an exploration program, focusing on the Rosemont area. Where large, experienced U.S. mining companies had failed, Augusta, an unproven Canadian mining company, now tells us they have drilled out a “world class” copper deposit.

Augusta’s Web site states that they have about 617 million tons of reserves, but only 134 million tons — 22 percent — are proven. The rest—78 percent—are only estimated.

It seems very risky for the U. S. Forest Service to approve a Plan of Operations for an unproven mining compamining mostly unproven reserves, when the consequences of the mining process could be so devastating.

Here is what probably would happen:

1. The Forest Service could grant Augusta the right to mine and dump waste onto as many as 850 un-patented mining claims that may ultimately total an area in excess of 25 square miles—more than twice the size of the entire communities of Green Valley and Quail Creek combined.

2. The mine would have an impact on the hydrology and water quality of the Davidson Canyon drainage system, important to the City of Tucson. If Augusta mines or dumps waste onto the northern tier of un-patented mining claims, this probably would alter the hydrology and water quality of the Sycamore Canyon drainage system, too, thus affecting Corona de Tucson also.

3. The mine would use enormous amounts of water from the Santa Cruz River aquifers—an estimated 5,000 to 7,000 acre-feet per year, an amount equal to that used annually by 20,000 to nearly 30,000 household members.

Augusta claims that the water it uses will be replaced by CAP water, though it does not have a CAP guarantee for the full life of the mine.

Furthermore, CAP water, with its very high content of dissolved solids, is not the same fresh, potable water that Augusta would pump from the Santa Cruz River aquifers. The trade-off of CAP water for groundwater is a bad deal.

4. The nearly pristine beauty of the Santa Rita Mountains would be destroyed forever. Mine reclamation procedures, though promised by Augusta, can never restore such beauty. One simply needs to look at the mine dumps at Green Valley to see this. Will real estate values be the same if large mining operations are carried on at residents’ back doors, with nighttime lights, rock blasting and truck noise?

5. Mining profits would flow to Augusta investors and at least some of the copper concentrates may be shipped overseas--- Augusta is talking about shipping concentrates by rail to the deep-water port at Guaymas, Mexico. Sumitomo Corp., one of the three largest trading companies in Japan and a major stockholder of Augusta, may dictate where the concentrates go.

6. These are some of the facts about mining operations in the Santa Rita Mountains. Is it worth allowing Augusta to proceed when there are so many potentially devastating consequences?

We Arizonans could be left with one or more huge holes in the ground, a ravaged and possibly contaminated countryside, and contaminated groundwater. Our tourists would certainly shun the areas they used to love for hiking, camping and other soul-enriching activities.

* The facts cited are from documents published by Augusta Resource or their consultants to satisfy information requests by the U. S. Forest Service or are from Augusta’s reports to its stockholders, both written and verbal.

Fred Tahse and his wife Carol have lived in Green Valley for six years. He received a Bachelor’s degree in geology from Yale University, and a master’s in Geology from the California Institute of Technology. His career was in the West, including California and Arizona with Chevron, Kennecott Copper briefly, and for many years, his own geological consulting firm.

The views expressed are the author’s and not necessarily this newspaper’s.


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