Resource evaluation in Duluth Complex: Geomodelr + PyGSLIB
We'll use Geomodelr to create a geological model that's going to be used in PyGSLIB to make a geostatistical evaluation.
Join us for a free webinar at 11 am E.T. on October 18 and help us evaluate the Nickel and Copper resources of Babbitt in the Duluth Complex while learning:
About our Webinar Speakers
Adrian has 16 years of experience as a consultant on resource estimation and technical reports, operational auditing, due diligence and technical risk analysis, mine geology, sampling and geological interpretation. He is an experienced geostatistician and mastered the use of non-linear geostatistics and conditional simulations for resource estimation, model validation, risk analysis, drillhole spacing, among other applications. He also has experience presenting and creating professional development training courses for geologists.
Ricardo is a developer and modeler with 10 years of experience in physical, geometrical and geological modeling. He has created computer models for everything from a ceramic tile to earthquakes covering tens of kilometers. He has authored and co-authored papers in computer simulations and computational geometry and topology. Ricardo started Geomodelr to give geologists a tool to put on a computer what they usually model on paper and to make their geological maps 3 dimensional without a huge effort. Geomodelr now has more than 700 users and is being used in universities to teach structural geology and to model everything from earthquakes to mineral deposits.
About the Duluth Complex
Duluth, the related Beaver Bay Complex, and the associated North Shore Volcanic Group are rock formations, which comprise much of the basement bedrock of the northeastern part of the U.S. state of Minnesota in central North America.
This complex is one of the largest intrusions of gabbro on earth, thus, one of the largest layered mafic intrusions known. It covers an area of 4715 km2. The lower portion of the intrusion along the northwestern margin consists of ultramafic cumulates with associated segregations of nickel, copper and platinum group elements and the upper differentiated portions include ilmenite bearing labradorite anorthosites.
We are going to model the Babbitt copper-nickel deposit, or Mesaba Project, (formerly known as Minnamax).
At the Babbitt deposit, there are both (mainly cubanite with lesser chalcopyrite) and massive sulphide mineralisation (pyrrhotite, cubanite, chalcopyrite and minor pentlandite)disseminated are found at the basal contact with the Palaeo- to Mesoproterozoic pelitic meta-sediments which have sporadic calcareous units.
Mineralisation at Babbitt also occurs 300 to 500 m higher in the complex in association with abundant xenoliths of country rock.
This second zone is known as the “Cloud Zone” and is not reported from elsewhere in the district.
Higher grade (>1% Cu) occurs near the basal contact of the meta-sediments, while much of the high grade semi-massive sulphide is found in the adjacent hornfelsed sediments or is spatially associated with the hornfels.
We can also find Disseminated sulphides (2 to 5%) in troctolites and norites around the semi-massive ores. Sulphide contents decrease above the basal zone, but increase again in the “Cloud Zones”.
Babbitt is one of eight deposits of low grade Ni-Cu and PGE that are distributed over a 35 km interval on the lower margin of the Duluth Complex.
These are from NE to SW – Spruce Road, Maturi, Dunka Pit, Serpentine, Minnamax (Babbitt), NorthMet, Wetlegs and Wyman Creek. Together these eight are said to contain 3.6 Gt @ 0.66% Cu, 0.2% Ni. The Babbitt deposit / Mesaba Project is said to contain >1 Gt @ 0.57% Cu, 0.14% Ni.