A feasibility study of a deep exploration project for massive sulphides in an old mining district

Simulation technique has been used for a feasibility study of a deep exploration project for massive sulphides in an old mining district, the Skellefte field. The outcome under very different conditions^has been studied. Under the specific conditions of the well known Skellefte field it is found to be possible to even calibrate the mathematical model.It is found that when the geology is not known in detail, an outcome of the order of 50 tons per meter drillhole is to be expected under a simple drilling strategy.When a certain knowledge about the general structures down to around 1 000 m is established, it is possible to improve the outcome by a factor of 2 through an optimization of the depth of investigation. The optimal depth of investigation is in the order of 500 m.On the other hand, when a minimum ore value is introduced as a function of depth, the expected outcome will again decrease with a factor of about 3-It must be underlined, that these results are average values in a mathematical model and do not say anything about the outcome in the single exploration case. However, in exploration campaigns of the order of 40 drillholes to a depth of 1000 m an analysis shows that at least one deep seated large body was found in 25/3 of the exploration campaigns.Faced with the problem whether to go or not to go into a deep exploration phase, this technique can headlight the the problem and it can give an estimate about the order of costs and benefits.digitalisering@um

A mathematical study of a deep exploration project : description of the simulation model and procedure

Simulation technique has been used for a feasibility study of a prospecting project for deep seated ore bodies.The simulation model is divided into three main parts: 1)The bedrock model - the mathematical model of the geology in the investigated block. 2)The ore model - the mathematical model of the "economical" targets within the investigated block. 3)The drilling model - the mathematical description of a borehole. Each part makes use of several parameters which make it possible to study different prospecting situations. Distribution functions for the parameters are estimated according to the geology of the Skellefte ore field.The simulation procedure consists of three parts: 1)Random location and determination of the geometry of ore bodies. 2)Location of boreholes. 3)Drilling procedure. The simulation procedure is realized in a computer by a system of computer programs.digitalisering@um

A feasibility study of exploration for deep seated ore bodies in the Skellefte field

Simulation technique has been used for a feasibility study of a deep exploration project for massive sulphides in an old mining district, the Skellefte field. The outcome under very different conditions has been studied. Under the specific conditions of the well known Skellefte field it is found to be possible to even calibrate the mathematical model.It is found that when the geology is not known in detail, an outcome of the order of 50 tons per meter drillhole is to be expected under a simple drilling strategy.When a certain knowledge about the general structures down to around 1 000 m is established, it is possible to improve the outcome by a factor of 2 through an optimization of the depth of investigation. The optimal depth of investigation is in the order of 500 m.On the other hand, when a minimum ore value is introduced as a function of depth, the expected outcome will again decrease with a factor of about 3.It must be underlined, that these results are average values in a mathematical model and do not say anything about the outcome in the single exploration case. However, in exploration campaigns of the order of 40 drillholes to a depth of 1000 m an analysis shows that at least one deep seated large body was found in 25% ot the exploration campaigns.Faced with the problem whether to go or not to go into a deep exploration phase, this technique can headlight the problem and it can give an estimate about the order of costs and benefits.digitalisering@um

Local school ideologies and inclusion: the case of Swedish independent schools

This paper reports on the development of a framework for the classification of local school ideologies in relation to inclusion that provides a tool for classifying the general educational direction as well as work with pupils in need of special support of individual schools. The framework defines different aspects of local school ideology in terms of values related to the societal level, school level, and individual level of the education system. The paper also reports on a study exploring variations among Swedish independent schools, concerning local school ideology using the framework as a theoretical tool. In this qualitative analysis, eight schools were selected from results of a questionnaire to all Swedish independent schools (return rate 79.5%) for further analysis based on interviews with different categories of school personnel, parents, and pupils. Five different patterns of local school ideologies were found more or less in line with values of inclusion, e.g. the holistic – inclusive and the market oriented – exclusive. Results are discussed in relation to the multiple and sometimes competing objectives that every school has to deal with and make priorities between. Implications for pupils in need of special support in a school system rapidly undergoing marketisation are finally discussed. Fristående skolors arbete med elever i behov av särskilt stö

upporting pre-planning design phases of new dementia care environments through group-modeling

Problem and rationale The pre-design phase, before architectural design details are presented is important for the success of the entire construction process. In this phase, it is important to identify the needs of the users and the organization. The present project describes a group-modeling project with system dynamics (SD) in the pre-design phase of a new dementia care environment. The aim was to support a dynamic design process that was oriented towards the users needs. SD uses models to create scenarios and experiment with different solutions to understand complex problems. The method is interactive and suited for group- modeling. The tools used are a construction of a diagram depicting the system and a mathematical model for scenario experiments. Methods and procedureThe group- modeling was performed during five workshops with stakeholders from the organization. The data for the model was collected through discussions with the modeling group, a questionnaire, literature reviews and documents. The process was documented by video-recording and field notes. The participants were interviewed at the end of the project. The data was analyzed by content analysis. ResultsResult show that the modeling process supported the group to explicitly express their goal regarding care. The modeling process moved the group discussions from space solutions and square meters to the goals of the care process. The model developed illustrates a modern perspective of dementia care. Conclusions Group-modeling using SD is interesting for the pre-design process. It can be feasible for linking strategic planning of the organization with the plan over the new healthcare environment since it moves the participants in the pre-design phase to focus on important issues about the care and away from a wish list of various needed spaces, commonly achieved in traditional planning processes