Stochastic Modeling of Chemical Compounds in a Limestone Deposit by Unlocking the Complexity in Bivariate Relationships

Modeling multivariate variables with complexity in a cross-correlation structure is always applicable to mineral resource evaluation and exploration in multi-element deposits. However, the geostatistical algorithm for such modeling is usually challenging. In this respect, projection pursuit multivariate transform (PPMT), which can successfully handle the complexity of interest in bivariate relationships, may be particularly useful. This work presents an algorithm for combining projection pursuit multivariate transform (PPMT) with a conventional (co)-simulation technique where spatial dependency among variables can be defined by a linear model of co-regionalization (LMC). This algorithm is examined by one real case study in a limestone deposit in the south of Kazakhstan, in which four chemical compounds (CaO, Al2O3, Fe2O3, and SiO2) with complexity in bivariate relationships are analyzed and 100 realizations are produced for each variable. To show the effectiveness of the proposed algorithm, the outputs (realizations) are statistically examined and the results show that this methodology is legitimate for reproduction of original mean, variance, and complex cross-correlation among the variables and can be employed for further processes. Then, the applicability of the concept is demonstrated on a workflow to classify this limestone deposit as measured, indicated, or inferred based on Joint Ore Reserves Committee (JORC) code. The categorization is carried out based on two zone definitions, geological, and mining units.

Multivariate Information Metallogenic Prognosis Model

Metallogenic circumstances spatial of the same category mineral deposit structure had defined commonality in a certain region. The important was that studied mineral deposit informations and determine the nature or a segment quantitative investigation, integrated experts’ experience to make sure the weight of dominate mineral factors, and constructed metallogenic prognosis model, and then proceed metallogenic prognosis and mineral resource evaluation use in other regions. To overcome geologic investigation problem which not unity and manifold explanation about geology、geophysics、geochemistry、remote geology at present.

Precambrian geology of the northern Nagssugtoqidian orogen,West Greenland:mapping in the Kangaatsiaq area

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article. van Gool, J. A., Alsop, G. I., Garde, A. A., Knudsen, C., Krawiec, A. W., Mazur, S., Nygaard, J., Piazolo, S., Thomas, C. W., & Thrane, K. (1). Precambrian geology of the northern Nagssugtoqidian orogen,West Greenland:mapping in the Kangaatsiaq area. Geology of Greenland Survey Bulletin, 191, 13-23. https://doi.org/10.34194/ggub.v191.5067 The Nagssugtoqidian orogen and its transition into the Rinkian orogen to the north were the main focus of the field activities of the Geological Survey of Denmark and Greenland (GEUS) in West Greenland in the summer of 2001. This work was carried out within the framework of the Survey’s three-year programme of bedrock mapping and mineral resource evaluation to enhance the understanding of the Archaean and Palaeoproterozoic crustal evolution in the transition zone between the Nagssugtoqidian and Rinkian orogens (Fig. 1). The work in the field season of 2001 comprised geological mapping of the 1:100 000 Kangaatsiaq map sheet described in this paper (Fig. 2), an investigation of the supracrustal rocks at Naternaq / Lersletten (Østergaard et al. 2002, this volume), a geochronological reconnaissance of the southern Rinkian orogen in the northern Disko Bugt region (Garde et al. 2002, this volume), a resource evaluation of the Nagssugtoqidian orogen (Stendal et al. 2002, this volume), a synthesis and interpretation of geophysical data of the central part of the Nagssugtoqidian orogen (Nielsen et al. 2002, this volume) and a report on investigations of the kimberlites and related intrusive rocks in the southern Nagssugtoqidian orogen and its foreland (Jensen et al. 2002, this volume).