{"@context":{"@vocab":"https://schema.org/"},"@type":"ItemList","@id":"https://api.ai-analytics.org/api/v1/msha/by-controller?name=Matthew%20M%20Koenig","controller":"Matthew M Koenig","_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":"2026-09-22T16:48:00.748Z"},"count":3,"truncated":false,"mines":[{"mine_id":"4703340","mine_name":"Risner Pit","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"WI","county_name":"Marinette","controller_name":"Matthew M Koenig","operator_name":"Koenig's Sand & Stone LLC","num_employees":2,"primary_canvass":"SandAndGravel","canonical_url":"https://api.ai-analytics.org/mine/4703340"},{"mine_id":"4703596","mine_name":"Portable Crushing Plant","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"WI","county_name":"Brown","controller_name":"Matthew M Koenig","operator_name":"Koenig's Sand & Stone LLC","num_employees":2,"primary_canvass":"SandAndGravel","canonical_url":"https://api.ai-analytics.org/mine/4703596"},{"mine_id":"4703876","mine_name":"Portable Screening Plant","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Intermittent","state":"WI","county_name":"Marinette","controller_name":"Matthew M Koenig","operator_name":"Koenig's Sand & Stone LLC","num_employees":2,"primary_canvass":"SandAndGravel","canonical_url":"https://api.ai-analytics.org/mine/4703876"}]}