{"@context":{"@vocab":"https://schema.org/"},"@type":"ItemList","@id":"https://api.ai-analytics.org/api/v1/msha/by-controller?name=Halstead%20Dick","controller":"Halstead Dick","_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":"2026-09-20T08:58:52.417Z"},"count":1,"truncated":false,"mines":[{"mine_id":"3901257","mine_name":"Willmott Gravel Pit","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"SD","county_name":"Brookings","controller_name":"Halstead Dick","operator_name":"Halstead & Lewis Construction","num_employees":null,"primary_canvass":"SandAndGravel","canonical_url":"https://api.ai-analytics.org/mine/3901257"}]}