{"name":"Mathiessen & Hegeler Drilling Activity in La Salle County, Illinois","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/mathiessen-hegeler/illinois/la-salle-il","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-08-06","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Mathiessen & Hegeler","operatorSlug":"mathiessen-hegeler","state":"IL","county":"La Salle","totalWells":50,"producingWells":0,"permits24mo":0,"spuds24mo":0,"ducCount":0,"topFormation":null,"rankInCounty":3,"firstPermitDate":"1970-01-01","lastPermitDate":"1970-01-01"}