Deposit

Kennecott

Also known as Bonanza, Jumbo, Mother Lode, Erie

A mineral deposit recorded by the USGS sediment-hosted copper database, at Alaska, United States. Its reported host rocks are Stromatolitic limestone, dolomite, microbial mats.. Minerals reported present include chalcocite, djurleite, covellite, bornite, chalcopyrite, digenite, anilite, luzonite.

recognition basis: authoritativeDatabase
realm: northAmerica

What this record is, and who says so

Recognised on the basis of

Authoritative database

A curated deposit database published by a scientific institution, in which inclusion is itself a documented editorial decision with stated criteria.

A deposit is an occurrence of sufficient size and grade that it might, under the most favourable circumstances, be considered to have economic potential. Lithoen records that a named authority made that judgement. It is not a statement that anything here is recoverable, and it is not a resource or a reserve.

Commodities documented here

Copper (commodity)documented association
The compilation reports a grade for this metal at this deposit. Lithoen records the documented association and infers nothing about how it would be worked.

Reported figures, and what each one is

A sample assay, a deposit average, a compiler total and a reported reserve are different quantities. Each figure below carries which one it is; none of them is a current resource or reserve.

4 Mt

Compiler total, for modelling

A sum assembled by a database compiler from production plus reserves plus resources at the lowest available cut-off, so that deposits can be compared in a grade-and-tonnage model. It is not a resource, not a reserve and not production; it is a modelling quantity, and the USGS databases Lithoen reads define their tonnage exactly this way.

The usgs sediment-hosted copper database reports an ore tonnage of 4.0 million tonnes for Kennecott.

13 wt%m Copper

Deposit average

An average grade attributed to a whole deposit by a compiler, over a tonnage defined by that compiler at a stated cut-off. Not a measurement of anything: a summary of an estimate.

The usgs sediment-hosted copper database reports a copper grade of 13.0 weight percent for Kennecott.

The source records behind this

What one row of a published dataset was taken to mean, and why. The original record stays traceable after reconciliation.

Sediment-hosted copper deposits of the world (USGS OFR 03-107), record 785
Named there
Kennecott
The source calls it
deposit
Lithoen reads it as
deposit (stated)
The usgs sediment-hosted copper database states what one of its rows is, and this row is read as the deposit the compilers named. The compilation is a database of sediment-hosted copper deposits.
Merged into this row by the compilers: Bonanza, Jumbo, Mother Lode, Erie. Those names were combined under the dataset’s own two-kilometre rule before Lithoen read it.
Read and refused
- grade and tonnage columns with no value — The compilation writes "(no value)" or leaves the field empty where the information was not available. Reading an empty field as zero would publish a measurement nobody made.

How this is mapped

One published representation of where Kennecott is. Each is one interpretation, by one identified source, at one scale — not the shape of the thing itself.

Representative point
Point · 1 positionspreferred for publication
A single position standing for something that is not a point. It exists so a feature can be shown on a map or listed by location, and it asserts NOTHING about extent. A representative point for a 2,000 km province is a label anchor, not a location.
A representative point for Kennecott from the USGS sediment-hosted copper database. It marks where the compilation places the deposit; it is not a boundary, not a shaft, and implies nothing about the body's extent.
Boundary certainty
ApproximateThe position is known only within a distance much larger than the line width on any map that shows it. Drawing it thinner does not make it better known.
Status of this geometry
inferredThe status of the geometry, which need not match the status of what the entity’s claims assert.
Dataset
Sediment-hosted copper deposits of the world (USGS OFR 03-107)Cox, D.P., Lindsey, D.A., Singer, D.A., Moring, B.C., and Diggles, M.F., 2003, Sediment-hosted copper deposits of the world: Deposit models and database: U.S. Geological Survey Open-File Report 03-107, doi:10.3133/ofr03107.
What was done to this geometry
- By Lithoen — Rounded to 4 decimal places. The compilation computed its decimal degrees from authored degrees-minutes-seconds columns, and the further digits are conversion residue rather than knowledge.
- Before it reached Lithoen — The compilation computed these decimal degrees from the degrees-minutes-seconds columns its compilers authored.

How this record is known

5
Settled consensus: Cited as the accepted position of the discipline.; 1
Open questions: Sourced statements that the answer is not currently known.

6 of 6 claims on this page cite at least one registered source. Counts describe how each statement is known, not how likely it is to be true.

What Lithoen records

Each claim states how it is known and cites its evidence.

Established13 wt%m Copper

Reported for this deposit

The usgs sediment-hosted copper database reports a copper grade of 13.0 weight percent for Kennecott.

scope: depositAverage
definition basis: Grade as the compilation reports it for this deposit.
assertion basis: SOURCE_REPORTED