Üç Boyutlu cevher kütle modellemesi yardımı ile bir maden galerisinin planlanması: Çulfa Çukuru PbZn-Cu-Ag yatağından örnek bir çalışma

Çulfa Çukuru Pb-Zn-Cu-Ag cevherleşmesi, Biga Yarımadası’nda Sakarya zonuna ait metamorfi tlerile metamorfi t-volkanik kayaç dokanakları boyunca ortaya çıkmıştır. Bu kayaçların dokanakları vekırık-çatlak düzlemleri boyunca gelişmiş baz metal (Pb-Zn-Cu-Ag±Au) cevherleşmeleri, kalksilikatikkayaç toplulukları içerisinde damar, mercek, saçınımlı cevher geometrileri şeklinde gözlenmektedir.Baz metal cevherleşmeler esas olarak yan kayaç (litoloji) kontrollü olup genellikle rekristalizekireçtaşları ile ilişkili olarak bulunmaktadır. Bu çalışmada Kalkım (Çanakkale) ilçesinin 20 kmgüney-güneydoğusunda yer alan Çulfa Çukuru bölgesine ait topoğrafi k veriler yardımı ile yeryüzüve yine bu bölgede gözlenen Pb-Zn yatağında yapılmış olan 42 adet yer üstü ve yer altı sondajlarındakesilen cevherli zonlar ve bunlara ait %Pb ve %Zn değerleri modellenmiştir. Yüzey ve yeryüzüverileri sırasıyla “Krigleme” ve “Ters Mesafe Ağırlıklı” yöntemlerle interpole edilmişlerdir. Yapılanher iki modelleme çalışması da çapraz doğrulama yöntemi ve tahmin hataları ile denetlenmiştir. Buçalışmadan elde edilen %Pb ve % Zn verilerinden, işletme sınırı üzerinde kalan alanlar 4 farklı sektöreayrılarak kesişim alanları tespit edilmiştir. Bunların yer altındaki konumları da kullanılarak muhtemelgaleri hatları belirlenmeye çalışılmış ve 450 katı için de yorumlanmış bir galeri haritası çizilmiştir.Yapılan bu modelleme çalışması, bir bölgede açılacak olan maden galerilerinin planlanmasınayardımcı olmaktadır. Ayrıca günün koşullarında meydana gelebilecek önemli değişikliklere göre (örn.maliyetlerin artması ya da azalması, metal fi yatlarındaki değişiklikler) işletme sırasında da modellerüzerinde değişiklik yapılabilinir.

An ore adit planning with the help of three dimensional ore body modeling: A case study from Çulfa Çukuru Pb-Zn-Cu-Ag deposit

Çulfa Çukuru Pb-Zn-Cu-Ag mineralization has occurred along the metamorphic and metamorphicdacitic volcanic rock contacts of the Sakarya zone on the Biga Peninsula. The base metal mineralizations (Pb-Zn-Cu-Ag±Au) developed along the contact and fracture planes of these rocks can be observed as veins, lenses and disseminated ore geometries in the calc-silicate rock assemblages. Base metal mineralizations are mainly controlled lithologically and are generally associated with recrystallized limestones. In this study, the surface and the subsurface were modeled using the topographical data and the geochemical data (%Pb and %Zn) collected from 42 boreholes of Çulfa Çukuru which is located 20 km South-Southeast of Kalkım (Çanakkale). The surface and the subsurface data were interpolated by Kriging and Inverse Distance Weighted methods, respectively. The intersectional areas of %Pb and %Zn modeling data obtained from this study were determined by dividing the areas above the cut-off grade into 4 different sectors (low, intermediate, high, and very high). Using the distribution of the intersections of these sectors, the possible adit lines were determined and also an interpreted map of the adit was drawn for 450 level. This modeling study helps to plan the ore adit to be opened in a mining area. Moreover, according to the important changings that may occur in conditions (e.g. fl uctuations in metal prices or decrasing-increasing costs), models can also be modifi ed during operations.

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