In this interview with Laurence Roulston and Eric Coffin, short term copper prices are discussed, and mention is made of a few recommended companies. Excelsior is one of them. The article is not long, but the section relevant to MIN I've quoted below the link.

http://copperinvestingnews.com/22858-copper-price-lawrence-roulston-eric-coffin-vric-mio-cum-mox-nsu-min.html?pmc=E-1&MyID=winter_sean@hotmail.com&utm_source=Resource+Investing+News&utm_campaign=d8e391c5d6-RSS_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_f83d87db0f-d8e391c5d6-241176073

"For his part, Coffin favors Nevsun Resources (TSX:NSU) and Excelsior Mining (TSXV:MIN). To be sure, Nevsun’s Bisha mine in Eritrea has been controversial from time to time, and Coffin admitted, “I’m not crazy about Eritrea.” That said, he still sees Bisha as “one of the best base metal [mines] in the world.” He likes Excelsior due to the very low projected cash cost for its Gunnison in-situ recovery copper project in Arizona."