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If you are in Edit Mode and you wish to see which elements you are currently saving results for, select View|Highlight Saved Results from the main menu. You can choose to highlight elements for which you are saving Time History results, Final Value results, or both. When you do this, all elements for which results will be saved will be highlighted in bold in the browser, and their output ports will be green in the graphics pane. Note also that you can globally change result saving options for all elements within a Container via the Change Result Options... button in the Container dialog.



The GoldSim Knowledge Base contains articles addressing frequently asked questions, workarounds for known problems, and advice on applying GoldSim. The Knowledge Base is available from within the GoldSim Resource Center (GRC). A few of the recent additions include:

Article 27: How to control the random number seed in simulations.

Article 28: How to plot distribution results at intermediate times within a simulation.

Article 29: Dealing correctly with temperature units in GoldSim.

We encourage you to visit the Knowledge Base, as even expert users are likely to find useful information there.



The GoldSim Model Library allows GoldSim users to build on the experience and knowledge of others by sharing models. The Library is available from within the GoldSim Resource Center (GRC).

Within the last few months we have added several models to the model library, including:

Model 27: Mortgage Calculator

Model 28: College Fund Planning Calculator

Model 29: Polya Problem

Model 30: Pilot Plant Example - Comparing Alternative Strategies under Uncertain Conditions

If you have a model that you think would be worthwhile to post to the library, please send it, along with text describing the model, to



Welcome to the Winter 2003 Issue of the GoldSim Newsletter! Published quarterly, our goal is to provide information that helps you get the most out of GoldSim. We also hope that the Newsletter can act as a vehicle to build connections between users within the GoldSim community.

Each newsletter delivers the latest GoldSim news, as well as a number of regular items. This includes a Featured GoldSim Application, tips from the GoldSim developers, a list of new models added to the GoldSim Model Library, a list of new GoldSim Knowledge Base articles, and a description of new features that the GoldSim Development Team is currently working on. Each Newsletter is archived on our website so you can revisit old issues.

Since this newsletter is for you, we encourage you to send us your comments and contributions. If you send us a contribution and we use it, we will acknowledge you in the Newsletter. Send your contributions to

The GoldSim Technology Group



Second Annual GoldSim User Conference

We are pleased to announce that the second annual GoldSim User Conference will be held in Seattle, WA USA on June 19-20, 2003. Prior to the conference, we will offer a two-day GoldSim training course for new GoldSim users on June 17-18, 2003. Also, for existing users, we will offer a set of advanced training seminars on Wednesday, June 18. The User Conference and the training will be held at the Washington Athletic Club in the heart of downtown Seattle.

Register Now!


GoldSim Academic User Community

We are also pleased to announce that we are forming a GoldSim Academic User Community. Once the community is formed, we plan to provide the following academic resources on our website: list of Academic users, list of papers that reference GoldSim, and model files prepared by academic users. It is our hope that these resources will facilitate further communication between members of the Academic community.

If you are an Academic user and are interested in becoming a member of the GoldSim Academic User Community, please contact us via email,, and provide us with the following information:

Link to personal website or the website of your University or your Department.

Brief description of area of interest.

Preferred email address to be listed in the Academic User Community.

List of papers that reference GoldSim (either published or working papers) that you would like to have added to our list of academic references.

Model files with a description that you would like to have added to our Model Library.


GoldSim Releases Service Pack SP-1 for GoldSim V. 7.51

GTG released one service pack, SP-1, in early January. SP-1 addresses the following issues:

A problem with hyperlink components, which did not always function correctly when embedded in dashboards.

Problems when cloning Material Time Series, Information Time Series, Sum, Extrema, Fluid and Source elements.

A problem with constant date/time strings (e.g. "01/01/2003") in input expressions. GoldSim mistakenly requested a unit string to be added to the date.

A problem with memory buildup while running complex models.

Several problems with large system fonts.

The CT/RT-module now gives better convergence in problems involving low-solubility, low-mobility species.

This service pack is available for all current members of the GoldSim Upgrade and Support program.


GoldSim Online Help is on the Way!

We are very close to finishing the online GoldSim Help system. This Help system essentially contains all of the information that is currrently in the printed User's Guide, but adds powerful navigation capabilities (including keyword and full text search, related topics lists, and hyperlinked cross references). In addition, the Help system is context sensitive - Help buttons in GoldSim dialogs will link to the appropriate topic in the Help file.

To complement the Help file, the User's Guide is also being updated. The main changes you will see there are that the page numbers no longer include chapter numbers, a detailed index (with over 1000 entries) and glossary have been added, and cross-references within the document have been made easier to spot. These will all make the manual easier to use as a reference document.

We will send a separate announcement to all users when the Help file and updated User's Guide (a PDF document) are available for download.



GoldSim Enhances the Environmental Assessment of the DeBeers Snap Lake Diamond Mine Project

Kenneth J. DeVos, Hydrogeochemist - Golder Associates, Mississauga, Canada
Donald F. Haley and Scott B. Donald, Hydrogeologists - Golder Associates, Guelph, Canada

Before a new mine can be developed, it is necessary for an environmental assessment (EA) to be completed and accepted by the regulatory agencies responsible for project approvals and licensing. Recently, De Beers Canada Mining Inc. (DeBeers) submitted an environmental assessment study for a major new diamond mine in Canada's Northwest Territories. This study relied on an integrated GoldSim model to assess the impacts of mining and site activities on site water quality.

The successful completion of EAs for large scale development projects requires the involvement of a large number of technical specialists and the communication of detailed scientific data, calculations, findings and conclusions to the regulatory agencies. Geologists, geotechnical engineers, hydrogeologists, hydrologists, geochemists, biologists, toxicologists, etc., each provide input based on their respective areas of expertise, and their inputs must be integrated in order to assess the overall environmental impact of the proposed development. The integration of the technical information, and the ability for others (e.g., regulators) to understand and review the assessment, is an extremely challenging task. From a technical perspective, over-simplification of the linkages between the various types of information can erode the technical quality of the assessment and therefore the quality of the decisions made on the most suitable manner in which to develop the project. From a process perspective, a lack of clarity or transparency in the calculation methodology will lead to lengthy reviews, increasing the time (and costs) required for regulatory approvals.



Our development team is working hard on some features that will show up in GoldSim later this year. Here's a sampling:

We're beefing up the ability to import graphics and make your models look great.

We're developing some new utility elements: a simplified Table element, a 'chance-node' element that will select an output at random when a triggering event occurs, an element to evaluate complex logic trees, and others.

We're adding some specialized elements to help you model the reliability of complex systems, including dependencies and failure modes.

We're adding an ability to let you iterate a part of your model at each time step, either for a specified number of iterations or until it meets a convergence test.

We're prototyping the Spatially-Distributed Module, which will allow users to create models that are replicated across a map. This should be a very powerful tool for modeling ecosystems, urbanization, or other spatial systems.

We're also planning to add a Financial Module, which will let you add powerful accounting and financial-statement capabilities to models that involve money.

If you're interested in helping us to test any of these capabilities, please send us an email at You may have to put up with a bug or two, but you'll be able to provide input and your assistance will be greatly appreciated. We'd also appreciate any suggestions that you might have for new GoldSim features!


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