"This way the metal grade fed to the mills is 2 or 3 times higher"

In the Q3 report those improvements were said to be 45% and 24% respectively. Would be nice to know exactly how they have progressed since.

"Since the Company assumed management on September 2, 2011, operational improvements have included moving the underground mine development out of the veins and into the adjacent footwall structures. Although this work has decreased production of plant feed temporarily, ore head grades to the plants have improved by approximately 45% for silver and 24% for gold, with the head grades and daily feed expected to continue to increase as the mine development opens more working faces for ore extraction. Process control improvements in the oxide plant have increased silver recoveries from approximately 54% to 73%, with additional metallurgical test work and operational improvements ongoing. Process control improvements in the sulfide plant have improved lead, zinc and pyrite concentrate production and quality. "

http://finance.yahoo.com/news/Golden-Minerals-Reports-Third-iw-2591744252.html?x=0&l=1