On the Size and Spacing of Volcanogenic Massive Sulfide Deposits within a District with Application to the Matagami District, Quebec

Carr, Patrick M.; Cathles, L. M.; Barrie, C. Tucker

doi:10.2113/gsecongeo.103.7.1395

Cited by 16 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both the Watson Lake and the Wabassee groups are locally crosscut by late phases of the underlying Bell River Complex, a large synvolcanic gabbro-anorthosite layered intrusion dated at 2724.6±2.5 Ma (Mortensen, 1993). This intrusion is generally interpreted as the thermal engine for the formation of the VMS deposits (Piché et al, 1993;Maier et al, 1996;Carr et al, 2008).…”

Section: Geological Contextmentioning

confidence: 99%

Lithological discrimination based on statistical analysis of multi-sensor drill core logging data in the Matagami VMS district, Quebec, Canada

Fresia

Ross

Gloaguen

et al. 2017

Ore Geology Reviews

View full text Add to dashboard Cite

In mineral exploration, traditional core logging is largely based on the visual inspection of drilled cores, a process which is often subjective and non-reproducible. However, a number of physical, chemical and mineralogical properties of rocks can now be measured at high spatial resolution on drill cores. The resulting large multiparameter databases can help geologists to quantitatively discriminate between lithologies, study hydrothermal alteration, and potentially vector towards mineralization. Multivariate statistical methods are important tools to assist geologists in interpreting such large databases. We present an application of model-based cluster analysis in the Matagami base metal mining district, more specifically to improve lithological discrimination at the zinc-rich Bracemac and McLeod volcanogenic massive sulfide (VMS) deposits. The model-based cluster analysis method is able to efficiently discriminate different geological units encountered, even in cases where two units are visually similar or in the presence of strong hydrothermal alteration.

show abstract

Section: Geological Contextmentioning

confidence: 99%

Lithological discrimination based on statistical analysis of multi-sensor drill core logging data in the Matagami VMS district, Quebec, Canada

Fresia

Ross

Gloaguen

et al. 2017

Ore Geology Reviews

View full text Add to dashboard Cite

show abstract

“…The parametric hybrid approach is now applied to data from the Caber VMS deposit of western Quebec, Canada, as shown in Figure 3a. Within the Superior Province, the copper-and zinc-rich Caber deposit is part of the Matagami camp of the Abitibi Greenstone Belt (Carr et al, 2008). Geologically, the prominent McIvor fault separates Caber and accompanying gabbros, rhyolites, and basalts from a granodiorite unit to the northeast (Adair, 2011).…”

Section: Caber Volcanogenic Massive Sulfide Depositmentioning

confidence: 99%

3D parametric hybrid inversion of time-domain airborne electromagnetic data

et al. 2015

View full text Add to dashboard Cite

We have developed a method to invert time-domain airborne electromagnetic (AEM) data using a parametric level-set approach combined with a conventional voxel-based technique to form a parametric hybrid inversion. The approach was designed for situations in which a voxel-based inversion alone may struggle. Such an example is where a distinct anomaly is present with sharp boundaries, and there is a large contrast between a low-resistivity target and a high-resistivity background. The first step of the proposed hybrid method used our novel parametric inversion to recover a best-fitting skewed Gaussian ellipsoid that represented the target of interest. Subsequently, the parametric result was set as an initial and reference model for the second stage, where smooth features with smaller resistivity contrasts were introduced into the model through a conventional voxel-based approach. The approach was tested with synthetic and field data. In the synthetic case, we recovered the size and dip of a conductive, thin, dipping plate with better accuracy compared with a voxel-based inversion. In the field example, we inverted AEM data over the Caber volcanogenic massive sulfide deposit. Based on information from past drilling, our results improve upon previous parametric plate inversions of the deposit itself, while additionally imaging the conductive cover over the deposit. These findings showcased how our parametric hybrid method can improve the accuracy of time-domain AEM inversions for thin dipping targets with large resistivity contrasts compared with the background. Preliminary results presented at SEG 2014 in a talk entitled: "Recovering a thin dipping conductor with 3D electromagnetic inversion over the Caber deposit." Manuscript

show abstract

“…Within the Superior Province, the region is part of the Matagami camp of the Abitibi Greenstone Belt (Carr et al, 2008). Locally, the large McIvor fault separates the Caber deposit along with accompanying gabbros, rhyolites and basalts from a granodiorite unit to the north-east (R. Adair, 2011, Zorayda Consulting Ltd. Technical Report), as shown in Figure 1.…”

Section: Caber Geologymentioning

confidence: 99%

Recovering a thin dipping conductor with 3D electromagnetic inversion over the Caber deposit

McMillan¹,

Schwarzbach²,

Oldenburg³

et al. 2014

SEG Technical Program Expanded Abstracts 2014

View full text Add to dashboard Cite

Airborne time-domain electromagnetic (EM) data were collected in 2012 over the Caber volcanogenic massive sulfide (VMS) deposit in western Quebec. We inverted the data in three-dimensions (3D) to produce a conductivity inversion model that helped image the thin dipping conductor and surrounding geology. The 3D inversion method consisted of a two-step approach. The first step employed a parametric inversion to recover a best-fitting shape of the dipping conductor using only data exhibiting an anomalous response over the deposit. With the parametric result as an initial and reference model, the second step used a conventional 3D EM inversion with data locations over the entire survey area. The second stage allowed for fine tuning of the shape and conductivity of the central dipping anomaly, while filling in features, such as overburden, in the remaining areas of the domain. The shape of the central conductive anomaly in the 3D inversion compared well with the known outline of the Caber deposit, based on geologic knowledge from past drilling. The overburden layer in the inversion model also agreed with previous geologic mapping. Preliminary results from this two-stage process show that it possible to recover a thin, dipping conductor with sharp boundaries through 3D EM inversion, which has been a difficult challenge in recent years.

show abstract

On the Size and Spacing of Volcanogenic Massive Sulfide Deposits within a District with Application to the Matagami District, Quebec

Cited by 16 publications

References 36 publications

Lithological discrimination based on statistical analysis of multi-sensor drill core logging data in the Matagami VMS district, Quebec, Canada

Lithological discrimination based on statistical analysis of multi-sensor drill core logging data in the Matagami VMS district, Quebec, Canada

3D parametric hybrid inversion of time-domain airborne electromagnetic data

Recovering a thin dipping conductor with 3D electromagnetic inversion over the Caber deposit

Contact Info

Product

Resources

About