Target MCL, WCL & NCL Exam 2026 | E.M.T. Vol-1 Chapter 3: Drilling & Boring MCQs | By Devendra Sir

Welcome to Lecture 1 of our Target MCL, WCL & NCL Exam 2026 series! In this session, Devendra Sir kicks off Chapter 3 of E.M.T. Volume 1, focusing on Drilling and Boring. This class is designed as an interactive MCQ session combined with conceptual revision. We cover the fundamental purposes of drilling holes (prospecting, determining seam gradient, and testing ground bearing pressure for heavy winding engines). Devendra Sir also provides a detailed breakdown of Methane Drainage Systems, explaining methods like In-Seam Drainage, Gob Drainage, Cross Measure Boreholes, and the Pack Cavity method. The lecture concludes by exploring different drilling techniques, including Percussive, Rotary (Tricone Rock Roller Bits), and Rope (Cable/Churn) drilling. 🕒 Video Chapters / Timestamps: [00:05] Class Start & Audio Check [01:24] Introduction to Chapter 3 MCQs: Drilling and Boring [03:22] Why do we drill holes? Prospecting, Mineral Existence, and Ground Bearing Pressure [06:06] Drilling for Gas and Water Drainage from Old Workings [06:24] Detailed Overview: Methane Drainage Methods (In-Seam, Gob, Cross-Measure, Superjacent) [10:04] Uses of Boreholes for Underground Operations (Cables, Stowing Pipes) [10:41] Standard Blast Hole Diameters in Mechanized Quarries (125mm to 300mm) [11:42] Using Drill Holes to Identify Faults (Position and Nature) [13:32] Managing Hole Diameter in Deep Holes (Larger at the start, reduced with depth) [14:45] The Two Main Methods of Drilling: Percussive and Rotary [15:02] Cable/Churn Drilling and Tricone Rock Roller Bits [17:25] How a circular hole is formed in Percussive Drilling [17:55] Choosing the right tools: Clay Augers for soft strata vs. V/T Chisels for very hard strata [19:52] The Function of a Derrick in Drilling Operations [21:48] Class Wrap-up and Preview of Next Lecture Download Mining Gyan 2.0:- https://clpdiy18.page.link/fUv6 Join Mining Gyan Premium Course 👉OSH & WC Code 2020 Course 🔗Link: https://felhim.courses.store/765781 👉GSSSB Course 🔗Link: https://felhim.courses.store/717061 👉MPPSC Course 🔗Link: https://felhim.courses.store/654104 👉 Mining Sirdar & Overman Foundation Course 🔗Link: https://felhim.courses.store/462433 👉 Mine Surveyor Course 🔗Link: https://felhim.courses.store/708642 Mining Gyan DGMS Exam Preparation  Courses Available on Mining Gyan 2.0 👉DGMS Mine Management, Legislation FMC/SMC Coal/Metal (UR/R) Live Online Course 🔗Link: https://felhim.courses.store/684372 👉DGMS Mine Ventilation FMC/SMC Coal/Metal (UR) Live Online Course 🔗Link: https://felhim.courses.store/684377 👉 DGMS Mine Machinery FMC/SMC Coal/Metal (UR/R) Live Online Course 🔗Link: https://felhim.courses.store/684378 👉 DGMS Mine Surveying FMC/SMC Coal/Metal (UR/R) Live Online Course 🔗Link: https://felhim.courses.store/684380 👉 DGMS Winning & Working FMC/SMC Coal/Metal (UR/R) Live Online Course 🔗Link: https://felhim.courses.store/684376 👉 DGMS Mine Foremen Live Online Course 🔗Link: https://felhim.courses.store/684395 👉 DGMS Mine Mate & Blaster Live Online Course 🔗Link: https://felhim.courses.store/684398 👉 DGMS Mining Sirdar & Overmen Live Online Course 🔗Link: https://felhim.courses.store/684397 MG Books Available on Mining Gyan & Mining Gyan 2.0 App 👉 Mine Legislation Book By Devendra Sir 🔗Link: https://felhim.courses.store/510464 👉 Ultimate Mining PYQs Book 🔗Link: https://felhim.courses.store/721111 👉 Mine Legislation & Ultimate PYQ Books Combo 🔗Link: https://felhim.courses.store/721113 👉 GATE 2026 MINING ENGINEERING 4 BOOKS COMBO 🔗Link: https://oeslt.courses.store/662106 👉 GATE Mining Engineering 2026 Book 🔗Link: https://oeslt.courses.store/679883 At Mining Gyan 2.0, we're not just a platform; we're your partners in success. Enjoy one-to-one guidance from industry experts and access a treasure trove of study materials to ensure your journey to becoming a proficient miner is smooth and successful. Subscribe now and let's embark on this educational adventure together! ⛏️✨ #MiningGyanPro #MiningExams #EmpoweringMiners