, ▁and ▁res umed ▁between ▁ 1 9 9 8 ▁and ▁ 1 9 9 5 . ▁Most ▁min ing ▁took ▁place ▁on ▁ben ch ▁claims ▁on ▁the ▁north ▁bank ▁of ▁the ▁cre ek . ▁The ▁main ▁pay ▁stre ak ▁is ▁about ▁ 2 ▁miles ▁long ▁and ▁as ▁much ▁as ▁ 1 , 0 0 0 ▁feet ▁wide . ▁Py rite ▁gra ins , ▁pol ished ▁c ass iter ite ▁p eb bles , ▁am orph ous ▁c ass iter ite ▁( wood ▁tin ), ▁bar ite ▁p eb bles , ▁and ▁a ▁little ▁magnet ite ▁were ▁recovered ▁with ▁the ▁gold . ▁ ▁Poss ibly ▁a ▁quarter ▁( appro xim ately ▁ 9 8 , 0 0 0 ▁ oun ces ) ▁of ▁all ▁the ▁gold ▁recovered ▁from ▁the ▁Ruby ▁district ▁before ▁ 1 9 6 0 ▁came ▁from ▁Po orm an ▁Creek . ▁Most ▁work ▁on ▁Po orm an ▁Creek ▁was ▁done ▁near ▁to ▁the ▁town ▁of ▁Po orm an . ▁ ▁R hy ol ite ▁por phy ry ▁( the ▁host ▁rock ▁of ▁Don lin ▁and ▁other ▁important ▁hard rock ▁gold ▁depos its ) ▁is ▁reported ▁to ▁under lie ▁the ▁cre ek ▁locally . ▁Bed rock ▁surrounding ▁Po orm an ▁Creek ▁is ▁Pale oz o ic ▁ph yll ite ▁and ▁quart z ite , ▁but ▁the ▁stream ▁flows ▁within ▁ 2 ▁miles ▁of ▁the ▁Po orm an ▁fault , ▁a ▁major ▁t ect onic ▁feature ▁ju xt ap osing ▁Inn oko ▁ter rane ▁ch ert ▁and ▁sl ate ▁with ▁the ▁Ruby