Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Common opal and chalcedony turn up in volcanic and alluvial ground in the hills around Wickenburg, Maricopa County. Sites are scattered, often claim-checked, and rarely signed—this pin marks the town-area search radius, not a single pit. Use current claim maps, stay on public land, and favor surface collecting with hand tools only.