{"name":"Horizontal Systems Drilling Activity in Clark County, Illinois","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/horizontal-systems/illinois/clark-il","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-09-04","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Horizontal Systems","operatorSlug":"horizontal-systems","state":"IL","county":"Clark","totalWells":105,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":"New Albany","rankInCounty":8,"firstPermitDate":"1970-01-01","lastPermitDate":"2012-11-30"}