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U prvom dijelu rada je prikazana zastupljenost dolomita u b-h kršu, kao i aktivna i potencijalna ležišta dolomita za AGK raznih trgovačkih naziva („Rujan“, „San“, „Gradac“), s raspoloživim rezultatima njihovih ispitivanja. U završnom dijelu rada dan je kratak povijesni osvrt na primjene dolomita kao AGK u Hercegovini, o čemu svjedoče mnogi nadgrobni spomenici, ali i neke vjerske, te stambene građevine. Zadnjih par desetljeća, svojom ljepotom tekstura i boja, te kvalitetom u izradi, dolomit je dosta korišten u unutarnjem i vanjskom oblaganju brojnih objekata u Hercegovini, kao i na nekoliko regionalnih projekata arhitekture duž jadranske obale, u Republici Hrvatskoj i Republici Crnoj Gori. U završnom dijelu rada dani su odgovarajući zaključci vezani za primjenu dolomita kao AGK., In the first part of this paper the occurrence of dolomite in B&H karst, as well as active and potential dolomite deposits for dimension stone with different trade names ("Rujan" , "San", "Gradac") are presented, with the available results of their testing. The final section of the paper gives a brief historical overview of the applications of dolomite as dimension stone in Herzegovina, which is attested by many tombstones, but also some religious and residential buildings. However, with its beauty of textures and colors and quality in workmanship, in the last several decades it has been widely used in the interior and exterior cladding of numerous buildings in Herzegovina, as well as in several regional architectural projects along the Adriatic coast, in the Republic of Croatia and Republic of Montenegro. The final section of the paper provides relevant conclusions related to the application of dolomite as dimension stone.

U ovom radu će se razmotriti ponovna upotreba otpadne kamene prašine i mulja iz klesarske djelatnosti. Teoretski dio rada obuhvaća klasifikaciju, sastav i uporabu arhitektonsko-građevnog kamena te pregled dosadašnjih istraživanja o uporabi otpadne prašine. U praktičnom dijelu rada prikupit će se informacije o djelatnosti rezanja, oblikovanja i obrade kamena u Republici Hrvatskoj i provesti će se anketa s ciljem utvrđivanja količine i vrste otpadne prašine odnosno mulja te procjena količina takve vrste otpada. Cilj rada je procjena tržišta (ponuda i potražnja) kako bi se povećala resursna učinkovitost i pomoglo uvođenje kružnog gospodarstva u klesarsku djelatnost., This thesis considers the reuse of waste stone dust and sludge from stonemasonry. The theoretical part of the paper includes the classification, composition and use of architectural and building stone and a review of previous research on the use of waste stone dust and sludge. Practical part of the thesis gathers the data on the activities of cutting, shaping and processing of stone in the Republic of Croatia, preforms a survey and assessment on the quantities and type of waste dust or sludge. The purpose of the thesis is to assess the market (supply and demand) in order to increase resource efficiency and facilitate the circular economy in the stonemasonry.

Učinkovit način eksploatacije blokova kamena ostvaruje se kombiniranjem lančane sjekačice i dijamantne žične pile zbog mogućnosti korištenja prednosti jednog ili drugog stroja. Lančane sjekačice se koriste za izradu horizontalnih i vertikalnih rezova, a primjenu su našle u površinskoj i podzemnoj eksploataciji u slabo do srednje abrazivnim i mekim do srednje tvrdim stijenama. Učinkovitost lančane sjekačice pri eksploataciji arhitektonskog kamena ovisi o pravilnom izboru radnih veličina stroja, reznih elemenata te uvjeta i načina eksploatacije u određenoj vrsti stijene. Iako su lančane sjekačice tehnološki napredovale, one još uvijek rade uz određene nedostatke. Dosadašnjim istraživanjima ustanovljeno je da sjekačice ne rade pri optimalnim radnim veličinama, a postojeće konstrukcije lanca nisu dovoljno optimalne. U radu su prikazane postojeće metode za određivanje učinka lančanih sjekačica, a na temelju dosadašnjih istraživanja izložene su smjernice za daljnja istraživanja., Chain saw machines are used for cutting vertical or horizontal cuts in underground and surface exploitation of dimension stone. Chainsaw performance in quarrying dimension stone depends on the right choice of machine’s operational parameters, cutting elements as well as the conditions and methods of quarrying in the certain type of rock. The key operational parameters which the operator must arrange on a chain saw are chain speed and cart speed movement, while the values of this parameters are based on manufacturer's recommendations and/or the operator experience. The main objective of this paper is to analyze the relationship between the operational parameters, chain design and chainsaw performance. Based on previous research, despite the limited literature on chain saw performance, it can be concluded that chain saws do not operate with optimum operational parameters, and current chain designs are not efficient enough. Influence of the cutting chain design on the chainsaw performance can be analyzed by laboratory tests using a linear cutting machine. Although previous researches provide specific guidelines to increase chainsaw performance, further research should be directed to determine the optimal arrangement and the number of tools in the cutting segment as well as to the influence of the cutting geometry on the force and cutting energy. It is also reported that insufficient efficiency of chainsaw machines is due the shallow depth of cuts taken by the cutting tools. Chain saw performance can be increased with the increase of the depth of cutting tools or with the decrease of chain speed respectively. Optimal chain speed cannot be determined solely on the basis of the specific energy since the optimal speed also depends on the cutting force and the wear of cutting tools as well as on the amount of material created during the cutting. Additional laboratory and field experiments should analyse the influence of the above quantities on chain saw performance in order to determine optimum constructional and operational parameters.

Prilikom izrade projektne dokumentacije najvažniji podatak za investitore predstavlja količina i iskorištenje rezervi mineralnih sirovina. Pri proračunu rezervi mineralnih sirovina potrebno je uzeti u obzir mnoge veličine, no jednako je važno koristiti metodu proračuna rezervi koja odgovara značajkama ležišta i osigurava pouzdan rezultat. Ležišta arhitektonsko-građevnog kamena, na kojima se blokovi pridobivaju podzemnom eksploatacijom, posjeduju određene specifičnosti koje se moraju poštovati pri proračunu eksploatacijskih rezervi. U ovom radu za proračun rezervi arhitektonsko-građevnog kamena na dijelu ležišta „Kanfanar-jug“, na kojem se kameni blokovi dobivaju podzemnom eksploatacijom, korišten je računalni program GEOL_DH. Spomenuti program bazira se na metodi blokova, kod koje se mineralna sirovina dijeli na blokove odgovarajućih dimenzija, koji se potom postavljaju u željenom pravcu koji osigurava najbolje iskorištenje mineralne sirovine. Cilj rada je prikazati osnove metode optimizacije geometrije iskopa i proračuna rezervi koji osiguravaju optimalno iskorištenje mineralne sirovine u ležištu., During the preparation of project documentation on the mineral resources, the most relevant data for investors is the amount of the reserves and utilization of mineral resources. When calculating the reserves of mineral resources, many parameters must be taken into account, but it is equally important to use the calculation method that suits the nature of deposit and provides reliable results. Dimension stone deposits on which blocks are acquired by underground exploitation, have certain peculiarities that must be respected while calculating the mineral reserves. In this paper, for the estimation of the dimension stone reserves on the part of the quarry "Kanfanar-south", where the stone blocks are excavated by underground mining, computer program GEOL_DH is being used. This program is based on the blocks method, in which the mineral resources are divided into the blocks of the adequate dimensions, which are then placed in the desired direction to ensure the best utilization of mineral resources. The aim is to present the basics of optimization method for geometry of underground exploitation that ensures optimal utilization of mineral resources in the deposits.