Method of underground rock blasting
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 26, 2016
Grant Date -
Sep 27, 2012
app pub date -
Sep 29, 2010
filing date -
Sep 29, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of blasting rock at an underground blast site in which boreholes (11a, b, c) are drilled in a rock mass (10) from a drive defining face (12), each borehole is loaded with at least one charge of explosive material (13a-c, 14a-c, 15a-c), at least one detonator is placed in operative association with each charge, and a sequence of at least two initiation events is conducted to blast the rock mass, in each of which only some of the charges are initiated, by sending firing signals to only the detonators associated with said charges and in which each initiation event is a discrete user-controlled initiation event. In one of the at least two initiation events a stranded portion of the rock mass such as a pillar is created that has already been drilled and charged, and the stranded portion of the rock mass is blasted in a subsequent one or more of the at least two initiation events without personnel accessing said stranded portion. First explosive charges (13a, b, c and 15a, b, c) may be blasted in the one initiation event, leaving a pillar of stranded ore with the preloaded borehole (11b) extending through it. The detonators may be wireless.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2010 Application Filing Year
- F42D Class
- 31 Applications Filed
- 19 Patents Issued To-Date
- 61.30 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 4 Citation Count
- F42D Class
- 35.71 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jul 26, 2027 |
