Anaconda Copper Mine (near Yerington)
E785394
The Anaconda Copper Mine near Yerington is a former open-pit copper mining operation in Nevada known for its significant production history and ongoing environmental contamination and cleanup efforts.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Anaconda Copper Mine (near Yerington) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9211993 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Anaconda Copper Mine (near Yerington) Context triple: [Yerington, Nevada, hasNearbyMine, Anaconda Copper Mine (near Yerington)]
-
A.
Pioche mining district
The Pioche mining district is a historic silver and lead mining area centered around the town of Pioche in southeastern Nevada, known for its rich ore deposits and boomtown past in the late 19th century.
-
B.
Capps Mine
Capps Mine is a historically significant gold mine in North Carolina known for its role in the state’s early gold-mining industry.
-
C.
Cortez Gold Mine
Cortez Gold Mine is a major gold-producing mining complex in north-central Nevada and one of the largest and longest-operating gold mines in the United States.
-
D.
Round Mountain Gold Mine
Round Mountain Gold Mine is a large open-pit gold mining operation in central Nevada known for its significant gold production.
-
E.
La Escondida copper mine
La Escondida copper mine is the world’s largest copper-producing mine, located in Chile’s Atacama Desert and a major contributor to global copper supply.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Anaconda Copper Mine (near Yerington) Target entity description: The Anaconda Copper Mine near Yerington is a former open-pit copper mining operation in Nevada known for its significant production history and ongoing environmental contamination and cleanup efforts.
-
A.
Pioche mining district
The Pioche mining district is a historic silver and lead mining area centered around the town of Pioche in southeastern Nevada, known for its rich ore deposits and boomtown past in the late 19th century.
-
B.
Capps Mine
Capps Mine is a historically significant gold mine in North Carolina known for its role in the state’s early gold-mining industry.
-
C.
Cortez Gold Mine
Cortez Gold Mine is a major gold-producing mining complex in north-central Nevada and one of the largest and longest-operating gold mines in the United States.
-
D.
Round Mountain Gold Mine
Round Mountain Gold Mine is a large open-pit gold mining operation in central Nevada known for its significant gold production.
-
E.
La Escondida copper mine
La Escondida copper mine is the world’s largest copper-producing mine, located in Chile’s Atacama Desert and a major contributor to global copper supply.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
former mining site
ⓘ
open-pit copper mine ⓘ |
| cleanupActivity |
containment of mine wastes
ⓘ
groundwater monitoring ⓘ soil remediation ⓘ |
| contaminant |
arsenic
ⓘ
heavy metals ⓘ sulfates ⓘ uranium ⓘ |
| country | United States of America ⓘ |
| endOfOperation | 1970s ⓘ |
| environmentalIssue |
groundwater contamination
ⓘ
soil contamination ⓘ waste rock and tailings ⓘ |
| hasFeature |
open pit
ⓘ
process ponds ⓘ tailings impoundments ⓘ waste rock dumps ⓘ |
| historicalSignificance | major mid-20th-century copper producer in Nevada ⓘ |
| impactOn |
local groundwater users
ⓘ
nearby agricultural lands ⓘ |
| knownFor |
environmental contamination
ⓘ
large-scale copper production ⓘ long-term cleanup efforts ⓘ |
| laterOwnedBy |
ARCO
ⓘ
Atlantic Richfield Company ⓘ BP (via ARCO) ⓘ
linked to:
BP America
|
| locatedIn |
Lyon County, Nevada
ⓘ
Nevada ⓘ |
| locatedNear | Yerington, Nevada ⓘ |
| miningMethod | open-pit mining ⓘ |
| near |
Walker River Basin
ⓘ
linked to:
Walker River
Yerington Paiute Tribe lands ⓘ |
| operatedBy |
Anaconda Copper Company
ⓘ
linked to:
Anaconda Copper Mining Company
|
| otherCommodity |
molybdenum
ⓘ
silver ⓘ |
| partOf | Yerington Mining District ⓘ |
| primaryCommodity | copper ⓘ |
| processingMethod |
heap leaching
ⓘ
milling ⓘ |
| regulator |
Nevada Division of Environmental Protection
ⓘ
U.S. Environmental Protection Agency ⓘ |
| startOfOperation | 1950s ⓘ |
| status |
abandoned mine site
ⓘ
inactive ⓘ |
| subjectOf |
environmental litigation
ⓘ
federal and state cleanup orders ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Anaconda Copper Mine (near Yerington) Description of subject: The Anaconda Copper Mine near Yerington is a former open-pit copper mining operation in Nevada known for its significant production history and ongoing environmental contamination and cleanup efforts.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.