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Home My WebLink About02-06 North American Emerald Mine File Pt. 21LAND QUALITY SECTION BLASTING ANALYSIS WORKSHEET (* = denotes fields where input data is needed) Permit No.*: 02-06 Permittee*: NAEM Inc Mine Name*: NAEM Quarry Blast Report No.*: 1 Peak Particle Velocity Check: Date of Blast*: 11/21/11 Time of Blast*: 11:45 D = Distance to closest offsite occupied structure (ft): D* = 1500.00 W = Maximum pounds of explosives per delay (pounds): W* = 9.00 SD = Scaled Distance: SD = D/W10.5 SD = 500.00 V = Peak Particle Velocity (inches per second): V = 160 (SD)A-1.6 V = 0.01 (*max. limit in mining permit is: V = 1.0 ips) Based on known distances from the blast to the seismograph and any additional location, the expected vibration level can be estimated at the second location as follows: V = Particle velocity measured by the seismograph (ips): V* = 0.00 DS = Distance from blast to seismograph (ft): DS* = 1500.00 d = Distance from blast to second location (ft): d* = 1500.00 PPV = Theoretical peak particle velocity at the closest offsite occupied structure (ips): PPV = V(DS/d)A1.5 PPV= 0.0010 Airblast (Overpressure) Check: P = Unconfined Airblast/Overpressure (psi): P = 82 (D/WA0.33)A-1.2 P = 0.030226 To convert (psi) to (dBL): (P/2.9 x 10A-9)log x 20 P = 140.36 AB = Confined Airblast/Overpressure (dBL): AB = P (dBL) - 35 dBL (for quarry situation) AB= 105.36 (*max. limit in mining permit is: AB = dBL) Explosives Column Check: (this is a very approximate method based upon numerous assumptions; specific densities may vary greatly depending upon the type and manufacturer of the explosive products used in the shot; must consider each explosive used; refer to Dupont Handbook for actual SPD, otherwise use the following:) Assumptions (per Ireco): If "straight' emulsion is used, use SPD (specific density) = 1.20 If a "blend/slurry" is used, use SPD (specific density) = 1.25 If "straight" anfo is used, use SPD (specific density) = 0.85 Ratio between explosives: Total pounds of Explos. #1 * = 64.00 Total pounds of Explos. #2* = N/A Ratio between explosives = N/A Average pounds of explosives used per hole (pounds)* = 4.50 Breakdown of average pounds of explosives per hole due to ratio: Explosive #1 = 64.00 Explosive #2 = N/A SPD = Specific densities for each explosive: SPD for Explos. #1* = 1.00 SPD for Explos. #2* = N/A HD = Hole Diameter Used in Shot (inches): HD* = 2.50 LD = Loading Density (pounds per foot of column): LD = SPD(.34)(HD)A2 LD for Explos. #1 = 2.13 LD for Explos. #2 = N/A Explosive column height for each explosive (feet): Explos. #1 = 2.12 Explos. #2 = N/A Total explos. column height = 2.12 Stemming height used in shot (feet)* = 9.00 Total height of explosive column(s) and stemming in the hole = 11.12 Total depth of hole denoted on the blasting report for the shot in question* = 10.00 Analysis Completed By: Date: Wehner, Judy From: AlexanderQuarry [alexanderquarry@bellsouth.net] Sent: Wednesday, February 08, 2012 11:03 AM To: Wehner, Judy Subject: RE: BLAST COMPLAINT Attachments: BLAST REPORT 112111.pdf, SAULS SEISMIC RPT NOV 2011.pdf Judy: Here are the items you requested. Sorry for delay. Have meetings happening. Randi S Van Vliet Alexander Quarry 531 Duncan Lane Hiddenite NC 28636 T: 828-635-8080 F: 828-635-7080 www.alexanderguarrV.com From: Wehner, Judy rmailto:iudv.wehner0ncdenr.00v1 Sent: Tuesday, February 07, 2012 9:16 AM To: AlexanderQuarry Subject: RE: BLAST COMPLAINT Thanks. From: AlexanderQuarry rmailto:alexanderquarry@bellsouth.net] Sent: Tuesday, February 07, 2012 7:50 AM To: Wehner, Judy Cc: JAMIE HILL Subject: BLAST COMPLAINT Judy: Good morning. I heard your message on the answering machine this morning about a blast complaint. You mentioned a Saturday, but didn't give a date. We have not blasted in about 2.5 months. But once 1 get a date, I can get you specific information. Thanks, Randi S Van Wet Alexander Quarry 531 Duncan Lane Hiddenite NC 28636 T. 828-635-8080 F. 828-635-7080 www.alexandenruarry com ,. Controlled Rock Drilling IN Blasting, Inc. Shot Report Blaster ► :� 9{pi/� Date:/ - Permit #: State: yr Project Location: v-,. Specifle Blast Location; Name of Contractor; Type of Project; Mass Rock ,X- Trench Footers Type of Rock; Granite rL Lime Shale _ Weather: Sky Temp a !E�— _ Wind Dir. & Speed Explosives: Brand & Type. i )hO0 Vv- .` Caps: Brand & Type; �p �!✓1 Ca rr -?- �~� %� r Name of Driller &Drill: ` /--T—c-or) 1 �- Shot #1 Shot #2 Shot #3 Shot #4 Shot #5 Shot #6 Shot #7 Time of Shot # of Hales a Hole Sizes Hole Depths Stemming Burden Spacing 3 # Df H les per Depay Powder Size t Se Max . per belasy Toil 1b5. in Slott COMMENTS: I 'd 91069L8b0L A006 03110UN00 WV 91 Z 800d-zf-Avw North American Emerald Mine Alexander Quarry Vibration and Air Overpressure Summary November 2011 La SEISMIC, INC. Sauls Seismic, Inc. 642-D Signal Hill Dr. Ext. Statesville, North Carolina 28625 Phone: 704-583-2525 Fax: 704-583-1008 VIBRATION AND AIR OVERPRESSURE SUMMARY Seismic research during the past forty years has established criteria which relate the occurrence of structural damage to certain levels of ground motion. Vibration damage criteria are now commonly expressed in terms of particle velocity, the rate of ground movement at a given point produced by ground vibrations as they pass that point. A state law is in effect in North Carolina to govern blasting operations which limits blast vibrations with a frequency of 30 hertz or greater to 2.0 inches/second of peak particle velocity. Additionally, air overpressure from air blasting is limited to 133 decibels. Seismograph Results For the period beginning November 01, 2011, and ending November 30, 2011, there were no blasts detonated at the Alexander Quarry. Seismograph Records A copy of the seismograph records for blast related events has been attached to this summary. You will also find a Monthly Review report consisting of a summary and graphical representation of the vibration results. Should you have any questions regarding this report or the results herein, please do not hesitate to contact me at my office. Sincerely, Sauls Seismic, Inc. Judy Blackburn Regional Manager North American Emerald Mine Alexander Quarry Monthly Review November, 2011 Duncan Lane 10 1 0.1 0.01 North American Emerald Mine Alexander Quarry Monthly Review November, 2011 Duncan Lane OSM / USBM R18507 Frequency (Hz) OVERPRESSURE(dBL) 145 140 135 130 125 W v 220 115 110 105 100 Wehner, Judy From: AlexanderQuarry [alexanderquarry@bellsouth.net] Sent: Tuesday, February 07, 2012 7:50 AM To: Wehner, Judy Cc: JAMIE HILL Subject: BLAST COMPLAINT Judy: Good morning. I heard your message on the answering machine this morning about a blast complaint. You mentioned a Saturday, but didn't give a date. We have not blasted in about 2.5 months. But once I get a date, I can get you specific information. Thanks, Randi S Van Vliet Alexander Quarry 531 Duncan Lane Hiddenite NC 28636 T. 828-635-8080 F: 828-635-7080 www. alexanderauarrv. com 1 North Carolina James D. Simons, PG, PE Director and State Geologist 4 NCDENR Department of Environment and Division of Land Resources Land Quality Section February 6, 2012 Mr. James K. Hill North American Emerald Mines, Inc. 531 Duncan Lane Hiddenite, North Carolina 28636-0233 RE: Blasting Complaint Alexander Quarry Permit No. 02-06 Alexander County Yadkin River Basin Dear Mr. Hill: Natural Resources Beverly Eaves Perdue, Governor Dee Freeman, Secretary This office recently received a complaint directed at blasting practices conducted at the above referenced quarry. According to the complainant, Ms. Dorothy Watkins, the vibrations produced from the blast at the Alexander Quarry on February 4, 2012 caused shook the ground. As provided in the mining permit for this site, you are requested to provide this office duplicate copies of all shot records related to the blasts conducted on February 4, 2012, including any seismograph recordings made. Furthermore, please forward all shot information for one production shoot conducted immediately before and one production shot after the blast in question for this office's review. It is recommended that you discuss this matter with Ms. Watkins. Her address and telephone number are as follows: PO Box 276 Hiddenite, North Carolina 28636 828-635-1126 I look forward to receiving the requested information in the near future. Your continued cooperation will be appreciated. !Judcith erely,6�.I A. ehner Assistant State Mining Specialist Land Quality Section cc: Mr. Zahid Khan 1612 Mail Service Center, Raleigh, North Carolina 27699-1612 •919-707-9220 / FAX: 919-733-2876 512 North Salisbury Street, Raleigh, North Carolina, 27604 Internet: http://portal.nodenr.org/web/lr/land-quality An Equal Opportunity 1 Affirmative Action Employer— 50% Recycled 110% Post Consumer Paper Wehner, Judy From: Boyer, Janet Sent: Monday, February 06, 2012 4:09 PM To: Wehner, Judy Subject: FW: Mine Blasting Complaint against Mine 02-06 Alexander Quarry Attachments: 20120206 Blasting Complaint Form.doc Janet S. Boyer, P.E. - Janet. BOyerPncdenr.gov State Mining Specialist North Carolina Dept. of Environment and Natural Resources Division of Land Resources - Land Quality Section 512 N. Salisbury Street Raleigh, North Carolina 27604 Tel: 919-707-9220 Fax:919-715-8801 Notice: Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is exempt by statute or other regulation. From: Eplin, Tamera Sent: Monday, February 06, 2012 4:07 PM To: Boyer, Janet Cc: Khan, Zahid; Kormanik, Ryan Subject: Mine Blasting Complaint against Mine 02-06 Alexander Quarry Hello Janet. Today we received a complaint against the Alexander Quarry (Mine Permit # 02-06). Please refer to the attached blasting complaint form. Ryan Kormanik, the inspector for Alexander County, asked me to relay to you that he will be in the area Wednesday, if you should need him to provide field assistance. Have a good day, Tamera Eplin, PE Assistant Regional Engineer NC Department of Environment and Natural Resources Division of Land Resources -- Land Quality Section 610 East Center Avenue, Suite 301 Mooresville, North Carolina 28115 Office: (704) 663-1699 Fax: (704) 663-6040 tamera.eoli n0ricden r.eov E-mail correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is exempt by statute or other regulation. MINE BLASTING COMPLAINT FORM NAME OF PERMITTEE: Alexander Quarry P6ng AffA -,&, Yam air a� MINE NAME/MINING PERMIT NUMBER: 02-06 COUNTY: Alexander COMPLAINANT=S NAME: Dorothy Watkins ADDRESS: Owner of 02-04 Hiddenite Gem Mine b� %(p PHONE #: 828-635-1126 1 APPROX. DISTANCE OF COMPLAINANT=S RESIDENCE TO MINE: I� DATES OF SEVERE BLASTS: Between 2 - 2:30 Saturday, 2/4/2012 WEATHER CONDITIONS DURING THE BLASTS IN QUESTION, IF KNOWN: Cloudy, misty, 40's NATURE OF COMPLAINT/COMMENTS: She stated a dynamite blast shook the ground (like dropping a bomb) and alleges that Alexander Quarry may have set it off. Stated they are supposed to give her advance notice and did not. She stated blasts have impacted her house in the past. She received a visit from the police/troopers investigating the situation due to a complaint, and would like an investigation by our Division. She further stated her mine permit does not allow blasting. INVESTIGATOR'S NAME: Call received by Tamera Eplin DATE COMPLAINT RECEIVED: 2/6/2012 Rev. Dec 2006