About Coring

Coring Magazine is a quarterly international magazine focusing on exploration core drilling. The magazine aims to deliver fresh information, case studies, opinions, news and articles about drilling companies, products, projects and more. Coring Magazine’s target audience is drilling contractors, exploration companies and mining company exploration departments, service companies, drilling suppliers and manufacturers and anyone involved in exploration core drilling. The driving force behind Coring magazine is the technical team, themselves drilling professionals experienced and well-known in the EDD industry. Because they speak the same language as the drilling industry, it is they who will decide on what is interesting and valuable for the readership and so earn a place in the magazine.

Coring Magazine Cover


Grigor Topev

Founder, Managing Editor

Grigor Topev is the founder and managing editor of Coring and co-owner of BG Drilling Solutions, an international directional drilling service supplier. He holds bachelor and master degrees in drilling engineering, and since graduating in Sofia, Bulgaria, in 2003, he has worked extensively in the diamond drilling industry, participating in drilling projects in Hong Kong, Japan, Australia, Sweden, Finland, Norway, Switzerland, Serbia, Bulgaria, Spain, Portugal, Ireland, Libya, Zambia, Brazil, Guyana and Canada. Though he has specialized in directional drilling during the last 15 years, he has broad experience in diamond drilling in general, working as drilling foreman on several projects.

Martina Samarova

Executive Officer

Martina Samarova has been part of Coring Magazine’s team since February, 2018. She has a bachelor’s degree in English Philology from Plovdiv University. She specialized in English and Linguistics at Loughborough University, UK. Martina has a master’s degree in Virtual Culture from Sofia University as well. She is qualified interpreter and has experience in the spheres of online media, social science and journalism.

Joanne Miller


Australian-born, Joanne’s led a nomadic existence, living and working in various Southeast Asian locales, the coalfields of rural Queensland, Australia and is seemingly drawn to the US’s triumvirate of mining states – Utah, Nevada and most recently, Southern Arizona. She’s an adept writer and editor, with an Australian Television and Radio Broadcasting and over 25 years experience in communicationsbased roles – copy and ghostwriting within government and private sectors, mineral exploration, oil and gas and luxury real estate and lifestyle publications. Her moniker, ‘The Word Surgeon’ provides just a hint of her deft ‘wordsmithing’. Joanne has officially joined Coring’s team for its 12th edition.

Tim Strong

Section Editor

Tim is Section Editor of Coring Magazine’s Exploration and Mining Geology section. He has been with Coring since May 2019. Tim is an exploration geologist with experience in Asia, Africa, Europe and the Americas. He has a general interest in the mining industry and new technologies for exploration and drilling. Tim graduated from the Camborne school of mines (UK) in Applied Geology.

Ivan Ginev

Design & Layout

Ivan Ginev is founder and creative director of Cog Graphics – a graphic design studio, based in Sofia, Bulgaria. The company provides professional design services to a wide variety of businesses, including media outlets, non-governmental organizations, property management companies, food and drink producers, etc.
Ivan has broad expertise in the fields of web design, visual identity and print design, coming from nearly 20 years of work in the design industry, and is always looking for the sweet spot between perfect visual aesthetics and common-sense practicality.