{"@context":{"@vocab":"https://schema.org/"},"@type":"ItemList","@id":"https://api.ai-analytics.org/api/v1/msha/by-controller?name=Helm%20Group%20Inc","controller":"Helm Group Inc","_source":{"data_provider":"AI Analytics","data_provider_url":"https://api.ai-analytics.org","license":"https://creativecommons.org/publicdomain/zero/1.0/","primary_source":"https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp","generated_at":"2026-09-09T19:38:52.469Z"},"count":13,"truncated":false,"mines":[{"mine_id":"1101575","mine_name":"Spread 1","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":5,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1101575"},{"mine_id":"1100236","mine_name":"Wash Plant 1","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"IL","county_name":"Jo Daviess","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":4,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100236"},{"mine_id":"1100232","mine_name":"Spread #2","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"IL","county_name":"Jo Daviess","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":2,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100232"},{"mine_id":"1102911","mine_name":"Spread 3","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":2,"primary_canvass":"SandAndGravel","canonical_url":"https://api.ai-analytics.org/mine/1102911"},{"mine_id":"1100007","mine_name":"Monte Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100007"},{"mine_id":"1100012","mine_name":"Spread 4","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Jo Daviess","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":0,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100012"},{"mine_id":"1100088","mine_name":"Wehrenburg Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100088"},{"mine_id":"1100089","mine_name":"Kurth","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100089"},{"mine_id":"1100402","mine_name":"Buss Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1100402"},{"mine_id":"1101576","mine_name":"Kutz Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1101576"},{"mine_id":"1102553","mine_name":"Faulkner Rock Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Civil Constructors Inc Of Freeport","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1102553"},{"mine_id":"1103027","mine_name":"Spread 5","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Carroll","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":0,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1103027"},{"mine_id":"1103229","mine_name":"Spread #6","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"IL","county_name":"Stephenson","controller_name":"Helm Group Inc","operator_name":"Conmat Inc., dba Helm Materials","num_employees":0,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/1103229"}]}