TiO2, 54% In Ilmenite, 18% In Crude Ore, In Ground

{
  "source_uuid": "90a94ea5-bca4-483d-a591-2e886c0ff47f",
  "source_name": "TiO2, 54% In Ilmenite, 18% In Crude Ore, In Ground",
  "source_context": [
    "natural resource",
    "in ground"
  ],
  "source_context_iri": "https://vocab.brightway.one/flow-contexts/reso-grou",
  "source_unit": "kg",
  "source_cas": "13463-67-7",
  "target_elementary_flow_id": "2906898f-6556-11dd-ad8b-0800200c9a66",
  "prepared_target_elementary_flow_id": "2906898f-6556-11dd-ad8b-0800200c9a66",
  "target_flow_object_id": "fo-d84e95cea44ee87b",
  "target_name": "Titanium",
  "target_context": [
    "Resource",
    "Ground"
  ],
  "target_unit": "kg",
  "prepared_target_resolution": "direct-active-target",
  "prepared_target_trace": [
    "2906898f-6556-11dd-ad8b-0800200c9a66"
  ],
  "prepared_context_decision": "mapped",
  "provenance": {
    "prov:wasGeneratedBy": "merge_ecoinvent",
    "prov:wasAttributedTo": "brightway-flows",
    "prov:hadPrimarySource": [
      "ecoinvent:3.8:90a94ea5-bca4-483d-a591-2e886c0ff47f",
      "TiO2, 54% In Ilmenite, 18% In Crude Ore, In Ground",
      ""
    ],
    "prov:wasDerivedFrom": "randonneur_replace_table:prepared_mapping"
  },
  "conversion_factor": 0.599,
  "conversion_comment": "ecoinvent measures the ore, EF 3.1 measures the metal: this flow is the mass of titanium dioxide in the ore, and it maps onto EF 3.1's elemental `titanium`. Both are in kg, so nothing in the units says a conversion is needed, and mapping at parity would credit an inventory with 1 kg of titanium for every 1 kg of TiO2 extracted. 0.599 is titanium's share of TiO2 by mass (47.867 / 79.866), and it is the factor ecoinvent's own `ecoinvent-3.8-biosphere-ecoinvent-3.12-biosphere-transitive` table states for this substitution. That table is the second leg of the ecoinvent 3.8 -> 3.12 (transitive) -> EF 3.1 chain. The chain actually taken here, the ecoinvent 3.8 -> 3.9 -> EF 3.1 chain, reaches the same EF 3.1 flow and states no factor, so without this row the conversion is lost to the choice of chain. ecoinvent replaced the ore flows with elemental `Titanium` at 3.10.1, so this ships in 3.8 and 3.9.1 only and the row is inert in later versions. Checked across releases against the three published correspondence tables that ever stated it -- `ecoinvent-3.9.1`, `-3.10.1` and `-3.11` biosphere to EF 3.1 biosphere -- which state the same number in each; 3.12 read 3.11's table and 3.8's was composed. The basis cannot carry a release's revision in any case: it is titanium's share of titanium dioxide by mass, which is arithmetic. (#162)"
}