The secondary research process involved comprehensive analysis of geological surveys, mining regulatory databases, steel industry publications, trade statistics, and authoritative mineral resource organizations. Key sources included the US Geological Survey (USGS) Mineral Commodity Summaries
, World Steel Association (worldsteel.org)
, Australian Bureau of Statistics (ABS), Geoscience Australia
, Brazilian National Mining Agency (ANM)
, China National Bureau of Statistics (NBS)
, Indian Bureau of Mines (IBM), Natural Resources Canada (NRCan), Eurostat Mining Statistics, International Iron and Steel Institute (IISI), UNCTAD Commodity Statistics, World Bank Commodity Markets, International Energy Agency (IEA) Steel Report, OECD Steel Committee, Russia Federal State Statistics Service (Rosstat), South Africa Department of Mineral Resources and Energy, Swedish Geological Survey (SGU), Peruvian Ministry of Energy and Mines, and Chilean Copper Commission (COCHILCO). These sources were used to collect production volumes, reserve estimates, trade flow data, price benchmarks, steel demand correlations, regulatory frameworks, and market landscape analysis for hematite, magnetite, limonite, siderite ore types, and pellet/sinter/concentrate products.