Show MEXICO TO TAKE BACK ITS MINES By Associated Press WASHINGTON March 1 13 The The Mexican bureau of mines has ordered a revision of aU all mining concessions granted by the Mexican 1 government The new Mexican con provides that mining concessions not developed are forfeited to the government and become nationalized Statistics complied compiled by the bureau ot or mines and included In a statement reaching Washington ton show that since 1910 a total of mining claims have ha been tiled filed in the Various states It If we add to these the concessions ranted granted under the Dias regime the statement said we get grants of which only or have been |