U.S. Interior Secretary Doug Burgum Says At Close Of Venezuela Visit, Companies Interested In Venezuela Have High Integrity; New Mining Law Will Create Opportunity For Companies To Come In, Improve Conditions; Venezuela Gov't Assured U.S. Of Security For Mining Companies; Steps Being Taken To Increase Flow Of Capital Back Into Venezuela, Will Stabilize Currency; He Is Sure Venezuela Will Exceed Oil Production Goals; Licenses Allowing Mining Companies On The Horizon