Archer has three tenements covering prospective phosphate and barite prospects.
Reconnaissance level exploration including literature searches and rock chip sampling has been conducted for phosphate. Exploration for barite evolved from its potential as a standalone project to a possible indicator of carbonatite intrusives. Carbonatite intrusive may be enriched in Rare Earth Elements (REE).
Primary focus has been on the tenements Worlds End (EL 4230) and Australia Plains (EL 4482). Archer also applied for additional ground west of Australia Plains EL4482 which has been registered as ELA 388/10 (Eudunda).
Worlds End (EL 4230)
Historic phosphate mines exist on both the Worlds End (EL4230) and Australia Plain (EL 4482) tenements.
Mines Department records indicate that production from these areas was limited and operations ceased before 1920.
Reconnaissance exploration has consisted of soil sampling and selected rock chip sampling. The Fairview Phosphatic unit was reported to have a width that varied from 60m to 120m and extended to a depth of 22m (figure 2).
Historic records indicate that the phosphatic units occur over a strike length of approximately 12kms stretching approximately 6km to both the north and south of the Fairview workings.
Future work will focus on rock chip sampling and to see if the phosphatic units can be traced using available radiometric data. Once the strike is known and furtherrock chip sampling is conducted across and along strike to confirm likely phosphate grades, it should be possible to determine the probability of identifying an economic deposit prior to committing funds for drilling.
Australia Plains (EL 4482)
Phosphate was reported in 1909 at the Rices Mine, where a 50ft shaft was sunk. The occurrence was noted to be ill-defined. Iron ore flux was once sourced from this occurrence. To the north (1.2km) along strike is another mine working, the Eime Phosphate Mine. No production records could be found for this mine (figure 3).
Two tenements were granted during early 2012, Eudunda (EL 4840) and Ediacara (EL 4869). The tenements were applied for primarily for their barite potential and possible Rare Earth Element (REE) potential.
The tenement resides SW of Leigh Creek and to the east coast of Lake Torrens. The barite appears to be associated with a fault system which forms a mineralised scarp down the centre of the tenement.
Future exploration will include literature searches and upon grant, rock chip and soil sampling to determine the size and tenor of the barite occurrences.
The tenement West of Australia Plains. Historical barite was mined within the tenement, these occurrences will be reviewed to determine the potential for mining potential.