{"@context":{"@vocab":"https://schema.org/"},"@type":"ItemList","@id":"https://api.ai-analytics.org/api/v1/msha/by-controller?name=MacDonald%20Development%20Corporation","controller":"MacDonald Development Corporation","_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":"2026-08-22T06:42:44.030Z"},"count":1,"truncated":false,"mines":[{"mine_id":"4500191","mine_name":"Tonasket Quarry","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Active","state":"WA","county_name":"Okanogan","controller_name":"MacDonald Development Corporation","operator_name":"Pacific Calcium Inc","num_employees":22,"primary_canvass":"Stone","canonical_url":"https://api.ai-analytics.org/mine/4500191"}]}