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| Frank P. Fritz |
| Fritz Geophysics |
| SDIRG, Smoothed Density Isostatic Residual Gravity for Zimbabwe. |
| Contents |
| Resume |
| Recent Paper Abstracts |
| Contact Information |
| Frank P. Fritz, Fritz Geophysics |
| Brief Resume |
| 42 years experience in Mineral Exploration Geophysics. Extensive field applications on six continents and 24 countries for most metals from Antimony to Zinc with emphasis on base metals and Gold. Supervision of data collection and interpretation of Helicopter ElectroMagnetics, Time Domain EM, IP, Complex Resistivity, Resistivity, CSMT, Airborne and Ground Magnetics, and Gravity. Additional experience in MagnetoTellurics and mineral applications for refraction and reflection seismics. Computer applications in data handling, interpretation, and modeling. |
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| Direct Applications in the Shaded Countries Above. This experience could be useful in your exploration program. |
| Professional Experience |
| Consultant, Fritz Geophysics 1986 to present |
| USA and Australia. |
| Consultant to Majors, Juniors, and Small miners through out the World. |
| Chief Geophysicist, BP Minerals Australia 1981 to 1986 |
| Perth, Western Australia. |
| Responsible for all geophysical applications throughout Australia, New Zealand, |
| and South East Asia. |
| Consultant, Fritz Geophysics 1978 to 1981 |
| Denver, Colorado |
| USA Regional Geophysicist AMAX Exploration 1969 to 1978 |
| Denver, Colorado and Tucson, Arizona. |
| Geophysicist, Geosciences Inc. 1967 to 1969 |
| Cambridge, Massachusetts. |
| Geophysicist The Anaconda Company 1965 to 1967 |
| Tucson, Arizona |
| Education |
| University of Arizona, 1966 to 1967 MS Geophysics. |
| Colorado School of Mines, 1960 to 1964 Geophysical Engineering Degree. |
| Geophysics should NOT be the "tool of last resort"! |
| Recent Paper Abstracts |
| The Economics of Geophysical Applications. |
| Abstract |
| Geophysical methods are an integral part of any exploration program and can be related to the cost of the only way to find new economic mineralization, the drill hole. For the same amount of dollars as one drill hole, the equivalent cost geophysical survey can collect data over 1/4 to 160 sq. km., depending on the method. If a reasonable physical property contrast can be expected for a particular target, an effective survey can be designed. Although any interpretation is only one of an expected infinite series, the addition of geological data and reasonable inferences can reduce the infinite to an ?optimistic? single interpretation. Attention to Survey Design, Survey Supervision, and Data interpretation for Regional, Local, or Detailed survey areas will assist in determining the best location for expensive drill holes. |
| The detailed geologic information collected in a very small volume of the exploration area must be reconciled with the bulk geophysical measurements for effective exploration and target definition. Throughout geophysical exploration history, a ratio of 10 has prevailed for the cost of a geophysicist, to the cost of the geophysical part of the program, to the total exploration budget, 1:10:100. Consideration of all the required questions, definition of the expected target, selection of the best physical property contrast, economic survey design, qualified contractor selection, reasonable field supervision, maintenance of high data quality, and integrated interpretations will lead to discovery of additional economic mineral resources with currently limited budgets. |
| Key Words: Geophysics, Exploration, Economics. |
| Three Dimensional Terrain Effects in Galvanic Resistivity Data |
| Abstract |
| All grounded galvanic resistivity data is influenced by terrain. Two dimensional corrections and models have been available from several sources for some time, but the three dimensional solution has been difficult until the advent of fast personal computers. Gradient, Tensor, Pole Dipole, and Dipole Dipole data can be effectively and economically corrected for complex terrain models. Comparison of the various arrays with simple terrain models show that there is no single best array. In some cases, the results can be surprisingly non-intuitive. The real world field cases shown demonstrate the usefulness of three-dimensional corrections. |
| The major problem in field application of terrain corrections appears to be definition of the terrain in sufficient detail and accurate locations of all electrodes relative to the terrain. GPS xyz locations, to an accuracy consistent with the array sizes, would be mandatory, if these corrections need to be made. Unusual electrode arrays may be advantageous in some areas to minimize terrain effects and reduce costs of surveys. |
| Key Words: Resistivity, Terrain, Corrections. |
| Integrated Geology, Geochemistry, Gravity, and Tensor IP in an Efficient Pediment Exploration Program Central Nevada, USA |
| NWMA Geophysics II Case Histories |
| Abstract |
| There is an estimated 100,000 sq. km. of bedrock with less than 500m of post Cretaceous cover available for exploration in Nevada. Major deposits like Pipeline have been discovered in the pediment. In 1995 and 1996, Cyprus-Amax conducted an effective exploration program over the west side of central Railroad Valley in east central Nevada. The program was a well-considered concentration of the available data and added surveys to determine if economic mineralization existed in the area. Regional geology, geochemistry, and public domain aeromagnetic and gravity data were compiled to select a local area of about 200 sq. km with almost complete alluvial cover. Additional proprietary gravity data were purchased and modeled with a three-dimensional prism modeling program to determine depth to basement and structures. Tensor IP-Resistivity was collected over the most promising part of the shallow basement with good structural control. The TIP data was sparse, but the available full tensor data allowed a complete interpretation of the area. Several targets with good IP effect highs, structural intersections, and shallow basement were drilled. While no economic targets were found the 200 sq. km. area was tested with a quick and economical program allowing exploration to continue in other areas. Perhaps the most interesting information derived from this program is that there are large areas of shallow pediment with significant topography on the basement, over 1km in this case. This means that drill locations could be within 100m of very shallow pediment and drill 100's of metres of dirt. |
| Key Words: Pediments, Geophysical Applications, Integration. |
| Contact Information |
| E-mail address |
| Web address |
| www.fritzgeoph.com |
| Phones |
| Home 970 593-1128 Fax 970 278-4034 |
| Mailing address |
| 560 Quillan Gulch Road Loveland Colorado 80537-9430 USA |
| Shipping address |
| 560 Quillan Gulch Road Loveland Colorado 80537-9430 USA |
| Current Projects |
| Last revised: Date 21 April 2007 |
| Voice 970 593-1128 Fax 970 278-4034 |
| Geophysics should NOT be the "tool of last resort"! |
| Thinly Covered Pediments in Nevada |
| Abstract |
| Key Words: Pediments, Gravity. |
| Fritz Geophysics has calculated a new version of a Depth to Basement Map for the Great Basin. This version is based on the Smoothed Density Isostatic Residual, calcualted previousy, and then tied to the outcrop of pre Cretaceous rocks. The resultant gravity data was then input to a Prism model to calculate a depth to basement for the Great Basin. The resultany map shows approximatlry 100,000 sq. km. of thinly covered pediments. The attached paper describes the process in more detail and shows examples of the calculations. |
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| Question?! |
| Since the inception of this web page some have asked, in effect, "what do I do that they might want to pay for." The very short answer is that I am the Company Geophysicist for companies without a geophysicist. In other words... "I help to find ore bodies." The experience is listed below. No, I do not have survey equipment. The long answer is the paper below, "The Economic of Geophysical Applications." The main parts, as descrtibed in the paper, are "Survey Design, Survey Supervision, and Data Interpretation." If this might be useful to you; call, E-mail, etc. and we can talk. |
| Key Words: Pediments, Geophysics, Mineral Exploration. |
| Pediment Exploration Programs Geophysical Applications. |
| Abstract |
| The link below will move you to a Power Point presentation on Pediment exploration. Text will be added in the near future. Check later for newer versions |
| Fritz Geophysics has moved! the new address, etc; 560 Quillan Gulch Road Loveland Colorado 80537-9430 970 593-1128 phone 970 278-4034 Fax |
| Fritz Geophysics has purchased the UBC IP-Resistivity 3-D forward and inversion modeling set. This is a DC 3-D mesh model that allows for any electrode configuration. The inversion is indeterminate but does often achieve a reasonable model. I am currently testing several data sets to find the problems and posibilities. Costs for a model probably will range from $500 for a simple case and to $2,000+ for complex and difficult cases. If you have a data set that could use a reasonable and considered model, call for an informative discussion! More on models as they are developed. |
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| Busy doing exploration in North and South America and Africa. |