IP and MT Survey for Dart identifies multiple drill targets

METHOD
Induced Polarisation and Resistivity, Magnetotellurics

LOCATION
Albury-Wodonga, VIC

BRIEF
Between May and August 2021 Fender Geophysics undertook a combined Magnetotellurics (MT) and Dipole-Dipole Induced Polarisation (DDIP) survey for Dart Mining (https://dartmining.com.au/). The purpose of the survey was the collection, quality control, and processing/inversion of MT/DDIP data at their Granite Flat Project to identify sites with possible copper and gold mineralisation. The survey area was located approximately 60km south-east of Albury-Wodonga, VIC.

CLIENT REQUIREMENT
Dart Mining requested six 2.4 km-long Induced Polarisation (IP) & Magnetotelluric (MT) profiles completed across the Granite Flat Project. The IP & MT surveys tested the porphyry mineralisation potential for the project that had been previously indicated by numerous long drill intersections of low-grade Copper-Gold mineralisation in altered granitic rock.

The survey was conducted using a newly acquired distributed acquisition system (gDAS32) to obtain combined Dipole-Dipole IP array data and a EMAP (ElectroMAgnetic Profile) style MT array. With this combination, Dipole-Dipole array data is collected during the day, and MT data is collected overnight (when conditions are often better for MT data acquisition).

OUTCOME

Interpretation of IP data indicated high chargeability anomalies coincident with suppressed resistivity. This pattern is commonly suggestive of porphyry-style disseminated sulphide mineralisation.
These anomalies identified several new drill targets including: 1) Significant, undrilled IP anomalies between 200-400m below surface, and 2) Multiple chargeability anomalies associated with granitic porphyry & aplite dykes
Significant IP anomalies identified both below and adjacent to existing drillholes demonstrating significant Cu and / or Au results, providing confidence in the interpretation of results
MT data imaged to depths of up to 1100m. A second phase of drilling will be based on an in-depth assessment of the MT data

Chairman, James Chirnside commented: “The IP and MT geophysical survey interpretation from Granite Flat has identified several significant Cu-Au targets which are now our primary focus for further drilling. The interpretation and revelations within the data are possibly the company’s most significant results to date, and we are very encouraged by them – in fact we could have scarcely asked for more. We now need to accelerate our exploration program at Granite Flat and give the project the attention it so clearly deserves.”