Authority: IC 14-34-2-1

Affected: IC 14-34

Sec. 93. (a) This section and sections 94 through 97 of this rule apply to blasting activities incident to underground mining. This section and sections 94 through 97 [of this rule] do not apply when blasts are detonated, for slopes and shafts, at depths greater than fifty (50) vertical feet below the original ground surface.

(b) Each permittee must comply with Indiana and federal laws that regulate the use of explosives.

(c) All blasting operations conducted after July 1, 1987, shall be conducted under the direct supervision of a certified blaster.

(d) A permittee must comply with the following blast design requirements:

1. (1) An anticipated blast design shall be submitted if blasting operations will be conducted within:

   1. (A) one thousand (1,000) feet of any building used as a dwelling (not owned by the permittee), public building, school, church, or community or institutional building; or
   2. (B) five hundred (500) feet of an active or abandoned underground mine.
2. (2) The blast design may be presented as part of a permit application or at a time, prior to the blast, approved by the director.

3. (3) The blast design shall:

   1. (A) contain sketches of the typical drill patterns, delay periods, and decking; and
   2. (B) indicate the type and amount of explosives to be used, critical dimensions, and the location and general description of the structures to be protected, as well as a discussion of design factors to be used, that protect the public and meet the applicable airblast, ground-vibration, and flyrock standards of section 96 of this rule.
4. (4) The blast design shall be prepared and signed by a certified blaster.
5. (5) The director may require changes to the design submitted if necessary to protect public safety or prevent damage to structures described in subdivision (1).

(e) The certified blaster and at least one (1) other person shall be present at the firing of a blast. The certified blaster shall either physically detonate the charge or give the order to detonate the charge.

(f) Each person responsible for blasting operations at a blast site shall be familiar with the approved blasting plan, and site-specific performance standards.

(g) Each person responsible for blasting operations shall possess a valid certification under 312 IAC 9. A certified blaster must make all decisions concerning the following:

1. (1) Blast hole size, spacing, or depth.
2. (2) The quantity of explosives in each hole.
3. (3) The total quantity of explosives to be detonated.
4. (4) The delay periods to be used.

(Natural Resources Commission; 312 IAC 25-6-93; filed Jun 21, 2001, 2:53 p.m.: 24 IR 3558, eff Dec 1, 2001; readopted filed May 29, 2007, 9:51 a.m.: 20070613-IR-312070146RFA; filed Apr 13, 2011, 11:16 a.m.: 20110511-IR-312100547FRA, eff Jul 25, 2012; readopted filed Sep 19, 2013, 10:12 a.m.: 20131016-IR-312130125RFA; readopted filed Mar 26, 2019, 3:40 p.m.: 20190424-IR-312190011RFA; readopted filed Mar 25, 2025, 9:50 a.m.: 20250423-IR-312240574RFA)