"Battle for Asarco to face key test in Texas court
* Grupo Mexico, Asarco and Sterlite head to federal court
* Hearing to set stage for decision on Asarco deal by judge
By Jazmine Ulloa
BROWNSVILLE, Texas, Oct 19 (Reuters) - India's Sterlite Industries... and Grupo Mexico SAB de CV (GMEXICOB.MX: ...) will head to court on Monday to begin the final stage of their year-long face off for control of bankrupt U.S. copper miner Asarco."