Ricardo Valls P. Geo., M. Sc.

Ricardo Valls P. Geo., M. Sc.

Toronto, Ontario, Canada
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Alicanto Mining Corp

About

Sr. Geologist, Sr. Geologist, Sr. Geologist, Sr. Geologist, Sr. Geologist, Sr. Geologist,…

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Articles by Ricardo

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Activity

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Experience

  • Alicanto Mining Corp

    Canada, Colombia

  • -

    Toronto, Canada Area

  • -

    Colombia

  • -

    Burkina Faso

  • -

    Armenia

  • -

    Venezuela

  • -

    Guatemala

Education

  • McGill University Graphic

    McGill University

    -

    Studied towards a Ph.D. degree
    Worked as a Teaching Assistant

  • -

    Not finished

  • -

    I obtained my B.Sc and M.Sc in economic geology

Licenses & Certifications

Volunteer Experience

  • Training

    Valls Geoconsultant

    Training in geochemistry and geomathematical modelling

Publications

  • Análisis comparativo entre la vía húmeda y la seca de prepaaración de las muestras de sedimentos

    revista Nuestro Pórtico

    El muestreo de sedimentos es uno de los métodos más ampliamente utilizados en los levantamientos geológicos regionales y las búsquedas orientativas. Sin embargo, no existe un criterio unificado sobre cómo preparar las muestras para los análisis existiendo en la actualidad dos vías de preparación: la húmeda y la seca.
    La vía seca es la más comúnmente utilizada, pero la vía húmeda tiene también sus defensores.
    En este trabajo comparé estadísticamente ambos métodos usando pruebas de…

    El muestreo de sedimentos es uno de los métodos más ampliamente utilizados en los levantamientos geológicos regionales y las búsquedas orientativas. Sin embargo, no existe un criterio unificado sobre cómo preparar las muestras para los análisis existiendo en la actualidad dos vías de preparación: la húmeda y la seca.
    La vía seca es la más comúnmente utilizada, pero la vía húmeda tiene también sus defensores.
    En este trabajo comparé estadísticamente ambos métodos usando pruebas de analogía así como el cálculo de algunos parámetros de comparación entre los dos métodos.
    Este análisis demostró que la efectividad de ambos métodos es análoga para el grado de sensibilidad y reproducibilidad de la técnica analítica empleada (análisis espectral semicuantitativo de 18 elementos en cabina de esparcimiento en los laboratorios de la Empresa Santa Clara, Cuba, 1989), si bien la vía húmeda garantiza una muestra más libre de impurezas mecánicas artificiales y reduce la presencia de calcio, elemento sumamente “nocivo” en el análisis espectral.
    Si bien este trabajo se basa en datos tomados por el autor y su grupo de trabajo hace muchos años, la validez del mensaje se mantiene razón por la cual la ofrecemos a nuestros lectores.

    See publication

  • El empleo de histogramas y de los polígonos de frecuencia en la interpretación de los datos geoquímicos

    Revista Nuestro Pórtico

    En este artículo se explican las metodologías para confeccionar histogramas de carácter continúo y discontinúo, así como la determinación de los estadígrafos más importantes como la media, la moda, mediana, ofreciéndose además la interpretación geológica de los mismos.
    De igual forma se detalla la interpretación los polígonos de frecuencias, determinación de percentiles, decitiles, cuartiles y su empleo como criterio para evaluar la perspectividad de una anomalía.

    See publication

  • Geología "artesanal"

    Revista Nuestro Pórtico

    En estos tiempos de avances tecnológicos, donde es difícil encontrar un centro de trabajo sin al menos una computadora y un escaneador y cuando un geólogo joven podría olvidarse de su martillo, pero no de su GPS, hablar de geología “artesanal” podría parecer algo fuera de lugar. Pero en mi experiencia he estado en ocasiones donde la inmediata necesidad de resolver una tarea in situ justifica la aplicación de métodos manuales para resolver una tarea.

    See publication

  • La paleo-reconstruccción geológica como herramienta de exploración

    Revista Nuestro Pórtico

    Es a veces difícil encontrar una aplicación práctica de los llamados “métodos académicos”, pero en otras ocasiones, los geólogos de “la industria” se olvidan de las múltiples posibilidades que brindan los métodos académicos en la actividad diaria del geólogo.

    Uno de estos métodos “académicos” es la paleo-reconstrucción geológica y en este artículo hablaremos acerca de su utilidad práctica como herramienta de exploración.

    See publication

  • La cianurización no es el enemigo... pero tampoco es la única opción

    Revista Nuestro Pórtico

    Se explican otras opciones de metalurgia extractiva

    See publication

  • Hubiese sido Sherlock Holmes un buen geólogo?

    Revista Nuestro Pórtico

    See publication

  • ¿Por qué es tan importante el control de los laboratorios?

    Revista Nuestro Pórtico

    Acerca de la importancia del QA&QC en la actividad de exploración.

    See publication

  • Geological Evolution on the NW Corner of the Caribbean Plate

    The origin and evolution of the Caribbean Plate

    The Caribbean Plate consists of a plateau basalt, formed probably in the Middle Cretaceous, complicated by a continental block, Chort√≠s, several magmatic arcs, strike‚Äìslip motions along major fault systems such as the Motagua‚ÄìPolochic fault zone in Guatemala, the pull-apart basin of the Cayman Trough and subduction zones below Central America and the Lesser Antilles. Five major collisional events have been identified: (i) Late Paleocene‚Middle Eocene collision of the Greater Antilles with…

    The Caribbean Plate consists of a plateau basalt, formed probably in the Middle Cretaceous, complicated by a continental block, Chort√≠s, several magmatic arcs, strike‚Äìslip motions along major fault systems such as the Motagua‚ÄìPolochic fault zone in Guatemala, the pull-apart basin of the Cayman Trough and subduction zones below Central America and the Lesser Antilles. Five major collisional events have been identified: (i) Late Paleocene‚Middle Eocene collision of the Greater Antilles with the Bahamas platform; (ii) Late Cretaceous collision of Chortis with the Maya Block; (iii) emplacement of nappes upon the Venezuelan foreland in the Cenozoic; (iv) collision of the Western Cordillera oceanic complex with the Central Cordillera of Colombia; and (v) Miocene collision of the eastern Costa Rica‚ Panama arc with the Western Cordillera. All these ‚orogenic events‚ show an eastward movement of the Caribbean Plate relative to the Americas. Migration of the Jamaica Block from the Pacific caused obduction of the oldest ophiolites of Huehuetenango at the western end of the Polochic‚ Rio Negro faults in Guatemala. South-southwest migration of the Chortis Block from west of Mexico and northward towards the Maya Block destroyed a trench associated with the Motagua‚ Jaloma fault system and caused the Chuacis Orogeny, emplacing Guatemalan ophiolite complexes and metamorphosing the rocks from the Chuacis Series.

  • Why and How Should Geologists Use Compositional data Analysis

    Wikibooks

    Compositional data arise naturally in several branches of science, including geology. In geochemistry, for example, these constrained data seem to occur typically, when one normalizes raw data or when one obtains the output from a constrained estimation procedure, such as parts per one, percentages, ppm, ppb, molar concentrations, etc.

    Compositional data have proved difficult to handle statistically because of the awkward constraint that the components of each vector must sum to unity…

    Compositional data arise naturally in several branches of science, including geology. In geochemistry, for example, these constrained data seem to occur typically, when one normalizes raw data or when one obtains the output from a constrained estimation procedure, such as parts per one, percentages, ppm, ppb, molar concentrations, etc.

    Compositional data have proved difficult to handle statistically because of the awkward constraint that the components of each vector must sum to unity. The special property of compositional data (the fact that the determinations on each specimen sum to a constant) means that the variables involved in the study occur in constrained space defined by the simplex, a restricted part of real space.

    Pearson was the first to point out dangers that may befall the analyst who attempts to interpret correlations between Ratios whose numerators and denominators contain common parts. More recently, Aitchison, Pawlowsky-Glahn, S. Thió, and other statisticians have develop the concept of Compositional Data Analysis, pointing out the dangers of misinterpretation of closed data when treated with “normal” statistical methods

    It is important for geochemists and geologists in general to be aware that the usual multivariate statistical techniques are not applicable to constrained data. It is also important for us to have access to appropriate techniques as they become available. This is the principal aim of this book.

    From a hypothetical model of a copper mineralization associated to a felsic intrusive, with specific relationships between certain elements, I will show how “normal” correlation methods fail to identify some of such embedded relationships and how we can obtain other spurious correlations. From there, I will test the same model after transforming the data using the CRL, ARL, and IRL transformations with the aid of the CoDaPack software.

    See publication

  • A Simple Procedure for the Integration on Non-digital Data into Lineament Analysis as an Exploration Tool

    The 12th Conference of the International Association for mathematical geology

  • When Zero Doesn't Mean It and Other Geomathematical Mischief

    The 12th Conference of the International Association for mathematical geology

Courses

  • Economic geology

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  • How researchers benefit from citing data

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Projects

  • Valls Geoconsultant

    - Present

    As a professional geologist with thirty-nine years in the mining industry, I have extensive geological, geochemical, and mining experience, managerial skills, and a solid background in research techniques, and training of technical personnel. I am fluent in English, French, Spanish, and Russian. I have been involved in various projects world-wide (Canada, Africa, Russia, Indonesia, the Caribbean and Central and South America). Projects included from regional reconnaissance to local mapping…

    As a professional geologist with thirty-nine years in the mining industry, I have extensive geological, geochemical, and mining experience, managerial skills, and a solid background in research techniques, and training of technical personnel. I am fluent in English, French, Spanish, and Russian. I have been involved in various projects world-wide (Canada, Africa, Russia, Indonesia, the Caribbean and Central and South America). Projects included from regional reconnaissance to local mapping, diamond drilling and RC-drilling programs, open pit and underground mapping and sampling, geochemical sampling and interpretation, and several exploration techniques pertaining to the search for diamonds, PGM, gold, nickel, silver, base metals, industrial minerals, oil & gas, and other magmatic, hydrothermal, porphyritic, VMS and SEDEX ore deposits. Special strengths are related to the acquisition of new properties, geochemical and geological studies, management and organization, geomathematical analysis and modelling, compositional data analysis, structural studies, database design, QA&QC studies, exploration studies and writing technical reports. P.Geo. registered in the province of Ontario.

    See project

Honors & Awards

  • Learning How to Learn: Powerful mental tools to help you master tough subjects

    University of California, San Diego

    Grade Achieved: 92.0%
    This course gives you easy access to the invaluable learning techniques used by experts in art, music, literature, math, science, sports, and many other disciplines. We’ll learn about the how the brain uses two very different learning modes and how it encapsulates (“chunks”) information. We’ll also cover illusions of learning, memory techniques, dealing with procrastination, and best practices shown by research to be most effective in helping you master tough subjects.…

    Grade Achieved: 92.0%
    This course gives you easy access to the invaluable learning techniques used by experts in art, music, literature, math, science, sports, and many other disciplines. We’ll learn about the how the brain uses two very different learning modes and how it encapsulates (“chunks”) information. We’ll also cover illusions of learning, memory techniques, dealing with procrastination, and best practices shown by research to be most effective in helping you master tough subjects.

    Using these approaches, no matter what your skill levels in topics you would like to master, you can change your thinking and change your life. If you’re already an expert, this peep under the mental hood will give you ideas for turbocharging successful learning, including counter-intuitive test-taking tips and insights that will help you make the best use of your time on homework and problem sets. If you’re struggling, you’ll see a structured treasure trove of practical techniques that walk you through what you need to do to get on track. If you’ve ever wanted to become better at anything, this course will help serve as your guide.

  • Writting in Science

    Stanford University

    This course trains scientists to become more effective, efficient, and confident writers. This is a hands-on course that emphasizes interactive examples and practice. In the first four weeks, we will review principles of effective writing, examples of good and bad writing, and tips for making the writing process easier. In the second four weeks, we will examine issues specific to scientific writing, including: authorship, peer review, the format of an original manuscript, and communicating…

    This course trains scientists to become more effective, efficient, and confident writers. This is a hands-on course that emphasizes interactive examples and practice. In the first four weeks, we will review principles of effective writing, examples of good and bad writing, and tips for making the writing process easier. In the second four weeks, we will examine issues specific to scientific writing, including: authorship, peer review, the format of an original manuscript, and communicating science for lay audiences. Students will complete editing exercises, write two short papers, and edit each others’ work.

Test Scores

  • Learning How to Learn: Powerful mental tools to help you master tough subjects

    Score: 92.0%

  • Writing in the Sciences

    Score: 90.3% with Distincti

Languages

  • Spanish

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  • Russian

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  • French

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  • English

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Organizations

  • APGO

    -

    - Present

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