pada tahun anggran 2005,kegiatan Inventarisasi minerl logam telah di lakukan di kab.limapuluh kota dan kab.sawahlunto-sijunjung ,prov,sumatera barat.berdasarkan dta sebelumnyam,kab.limapuluh kota memiliki indikasi logam dasar daerah dan perak di sekitar hulu batang umbilin dan mangan di desa hulu air(kec.harau).kab.sawahlunti-sijunjung meiliki indik…
The semi-detailed survey conduced during phase III (september to December 1986) in the long laai and long bia areas bore on polymetallic and gold anomalies detected by the 1979-1982 exploration compaign. Gold washing sites had also been recorded. These anomalis lie in the Mentarang volcano-sedimentary Formation, Probably lower Eocene in age.