Mise-À-La-Masse (MALM)

Applications in Mineral Exploration

Cross-hole MALM

• Provides an electrical relationship between various intersections of conductive minerals encountered in DDHs.
• Lateral extension delineation of a conductive mineralized zone intersected by one or more drill holes.
• Establishes the strike and dip of a conductive mineralized zone.
• To map extension of conductor requires at least one DDH intersecting the mineralized zone.
• Investigation depth is equal to the drill hole depth.
• A field crew of only 2 – 3 operators is required.
• Optimizes drilling program, reduces risk of barren holes.

Ground MALM

• Delineates extension of a previously identified conductive (and polarizable) mineralized zone (outcropping or intersected by drill holes).
• Establishes the surface projection, strike, dip, and plunge of a conductive zone.
• Identifies potential satellite conductive ore-bodies.
• A field crew of only 2 – 3 operators is required.
• Fast and economical survey.
• Straightforward field procedures.

Survey Parameters

• Measurement of absolute potential (V) or potential difference (ΔV) values.
• The normalised potential is obtained from the measured potential and injected current.
• Calculation of apparent resistivity values from observed potential and true distance of electrode positions.
• In-field QC, processing and plotting performed using our proprietary Refusilo^® software.
• Receiver: ELREC-PRO from IRIS Instruments (10 input channels and 20 decay curve sampling windows).
• Transmitter: Tx-III from GDD Instruments (7.8 kw).

Supplied Products

• Profiles of the normalized potential and apparent resistivity.

The observed maximum potential in hole D92-2430 reveals the extension of the massive MALM zone intercepted in hole D92-2299.