United States Nuclear Tests With Unannounced Simultaneous
Detonations
Department of Energy
United States Nuclear Tests With Unannounced Simultaneous Detonations -- By
Date
Operation Niblick
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
1 Kohocton* 08/23/63 NTS Shaft Weapons Related Low
Natches 08/23/63 NTS Shaft Weapons Related Low
Simultaneous, separate holes
2 Barracuda 12/04/63 NTS Shaft Weapons Related Less than 20 kt
Sardine* 12/04/63 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Whetstone
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
3 Barbel* 10/16/64 NTS Shaft Weapons Related Less than 20 kt
Turnstone 10/16/64 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
4 Drill
(Source-Lower) 12/05/64 NTS Shaft Weapons Related Less than 20 kt
Drill*
(Target-Upper) 12/05/64 NTS Shaft Weapons Related 3.4 kt
Simultaneous, same hole
5 Cassowary* 12/16/64 NTS Shaft Weapons Related Less than 20 kt
Hoopoe 12/16/64 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Flintlock
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
6 Moa 09/01/65 NTS Shaft Weapons Related Less than 20 kt
Screamer* 09/01/65 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
7 Finfoot* 03/07/66 NTS Shaft Weapons Effects Less than 20 kt
Cinnamon 03/07/66 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Crosstie
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
8 Buggy*-A 03/12/68 NTS Crater Plowshare # 1.08 kt
Buggy-B 03/12/68 NTS Crater Plowshare 1.08 kt
Buggy-C 03/12/68 NTS Crater Plowshare 1.08 kt
Buggy-D 03/12/68 NTS Crater Plowshare 1.08 kt
Buggy-E 03/12/68 NTS Crater Plowshare 1.08 kt
Simultaneous, separate holes
Row charge experiment--five simultaneous detonations
9 Noor* 04/10/68 NTS Shaft Weapons Related 20 to 200 kt
Throw 04/10/68 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
10 Tub*-A 06/06/68 NTS Shaft Weapons Related Less than 20 kt
Tub-B 06/06/68 NTS Shaft Weapons Related Less than 20 kt
Tub-C 06/06/68 NTS Shaft Weapons Related Less than 20 kt
Tub-D 06/06/68 NTS Shaft Weapons Related Less than 20 kt
Tub-F 06/06/68 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Bowline
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
11 Bit*-A 10/31/68 NTS Shaft Weapons Related Less than 20 kt
Bit-B 10/31/68 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
12 Crew-2nd 11/04/68 NTS Shaft Weapons Related Less than 20 kt
Crew-3rd 11/04/68 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
13 Tyg*-A 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Tyg-B 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Tyg-C 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Tyg-D 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Tyg-E 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Tyg-F 12/12/68 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
14 Gourd*-Amber 04/24/69 NTS Shaft Weapons Related Less than 20 kt
Gourd-Brown 04/24/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
15 Ipecac*-A 05/27/69 NTS Shaft Weapons Related Less than 20 kt
Ipecac-B 05/27/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
16 Bowl*-1 06/26/69 NTS Shaft Weapons Related Less than 20 kt
Bowl-2 06/26/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Mandrel
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
17 Spider*-A 08/14/69 NTS Shaft Weapons Related Less than 20 kt
Spider-B 08/14/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
18 Kyack*-A 09/20/69 NTS Shaft Weapons Related Less than 20 kt
Kyack-B 09/20/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
19 Seaweed-C 10/01/69 NTS Shaft Weapons Related Less than 20 kt
Seaweed*-D 10/01/69 NTS Shaft Weapons Related Less than 20 kt
Seaweed-E 10/01/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
20 Pod*-A 10/29/69 NTS Shaft Weapons Related Less than 20 kt
Pod-B 10/29/69 NTS Shaft Weapons Related Less than 20 kt
Pod-C 10/29/69 NTS Shaft Weapons Related Less than 20 kt
Pod-D 10/29/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
21 Culantro*-A 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Culantro-B 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
22 Tun*-A 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Tun-B 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Tun-C 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Tun-D 12/10/69 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
23 Terrine*-White 12/18/69 NTS Shaft Weapons Related 20 to 200 kt
Terrine-Yellow 12/18/69 NTS Shaft Weapons Related 20 to 200 kt
Simultaneous, separate holes
24 Fob*-Green 01/23/70 NTS Shaft Weapons Related Less than 20 kt
Fob-Red 01/23/70 NTS Shaft Weapons Related Less than 20 kt
Fob-Blue 01/23/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
25 Yannigan*-Red 02/26/70 NTS Shaft Weapons Related 20 to 200 kt
Yannigan-Blue 02/26/70 NTS Shaft Weapons Related 20 to 200 kt
Yannigan-White 02/26/70 NTS Shaft Weapons Related 20 to 200 kt
Simultaneous, separate holes
26 Arabis*-Red 03/06/70 NTS Shaft Weapons Related Less than 20 kt
Arabis-Green 03/06/70 NTS Shaft Weapons Related Less than 20 kt
Arabis-Blue 03/06/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
27 Can-Green 04/21/70 NTS Shaft Weapons Related Less than 20 kt
Can*-Red 04/21/70 NTS Shaft Weapons Related 20 to 200 kt
Simultaneous, separate holes
28 Hod*-A (Green) 05/01/70 NTS Shaft Weapons Related Less than 20 kt
Hod-B (Red) 05/01/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
29 Cornice*-Yellow 05/15/70 NTS Shaft Weapons Related 20 to 200 kt
Cornice-Green 05/15/70 NTS Shaft Weapons Related 20 to 200 kt
Simultaneous, separate holes
30 Flask*-Green 05/26/70 NTS Shaft Plowshare # 105 kt
Flask-Yellow 05/26/70 NTS Shaft Plowshare Less than 20 kt
Flask-Red 05/26/70 NTS Shaft Plowshare Less than 20 kt
Simultaneous, separate holes
31 Piton*-A 05/28/70 NTS Shaft Weapons Related Less than 20 kt
Piton-B 05/28/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Previously announced as Piton
32 Arnica*-Yellow 06/26/70 NTS Shaft Weapons Related Less than 20 kt
Arnica-Violet 06/26/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Emery
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
33 Scree*-Acajou 10/13/70 NTS Shaft Weapons Related Less than 20 kt
Scree-Alhambra 10/13/70 NTS Shaft Weapons Related Less than 20 kt
Scree-Chamois 10/13/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
34 Truchas-Chacon 10/28/70 NTS Shaft Weapons Related Less than 20 kt
Truchas*-
Chamisal 10/28/70 NTS Shaft Weapons Related Less than 20 kt
Truchas-Rodarte 10/28/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
35 Carrizozo 12/03/70 NTS Shaft Weapons Related Less than 20 kt
Corazon* 12/03/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
36 Avens-Andorre 12/16/70 NTS Shaft Weapons Related Less than 20 kt
Avens-Alkermes 12/16/70 NTS Shaft Weapons Related Less than 20 kt
Avens-Asamlte 12/16/70 NTS Shaft Weapons Related Less than 20 kt
Avens-Cream* 12/16/70 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Previously announced as Cream
Operation Grommet
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
37 Nama*-Amarylis 08/05/71 NTS Shaft Weapons Related Less than 20 kt
Nama-Mephisto 08/05/71 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
38 Frijoles*-Deming 09/22/71 NTS Shaft Weapons Related Less than 20 kt
Frijoles-Espuela 09/22/71 NTS Shaft Weapons Related Less than 20 kt
Frijoles-Guaje 09/22/71 NTS Shaft Weapons Related Less than 20 kt
Frijoles-Petaca 09/22/71 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
39 Ocate 03/30/72 NTS Shaft Weapons Related Less than 20 kt
Onaja* 03/30/72 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Toggle
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
40 Cebolla 08/09/72 NTS Shaft Weapons Related Less than 20 kt
Cuchillo* 08/09/72 NTS Shaft Weapons Related Less than 20 kt
Solano 08/09/72 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
41 Canna*-Umbrinus 11/17/72 NTS Shaft Weapons Related Less than 20 kt
Canna-Limoges 11/17/72 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
42 Flax*-Test 12/21/72 NTS Shaft Weapons Effects 20 to 200 kt
Flax-Backup 12/21/72 NTS Shaft Weapons Effects Less than 20 kt
Simultaneous, same hole
43 Angus* 04/25/73 NTS Shaft Weapons Related Less than 20 kt
Velarde 04/25/73 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
44 Rio Blanco*-1 05/17/73 Rifle Shaft Plowshare # 33 kt
Rio Blanco-2 05/17/73 Rifle Shaft Plowshare 33 kt
Rio Blanco-3 05/17/73 Rifle Shaft Plowshare 33 kt
Simultaneous, same hole
Joint Government/industry gas stimulation experiment
Operation Arbor
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
45 Pinedrops*-Sloat 01/10/74 NTS Shaft Weapons Related Less than 20 kt
Pinedrops-Tawny 01/10/74 NTS Shaft Weapons Related Less than 20 kt
Pinedrops-Bayou 01/10/74 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Bedrock
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
46 Crestlake*-
Tansan 07/18/74 NTS Shaft Weapons Related Less than 20 kt
Crestlake-Briar 07/18/74 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
47 Portola* 02/06/75 NTS Shaft Weapons Related Less than 20 kt
Portola-Larkin 02/06/75 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Fulcrum
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
48 Cove 02/16/77 NTS Shaft Weapons Related Less than 20 kt
Oarlock* 02/16/77 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
49 Dofino* 03/08/77 NTS Shaft Weapons Related Less than 20 kt
Dofino-Lawton 03/08/77 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
50 Gruyere* 08/16/77 NTS Shaft Weapons Related Less than 20 kt
Gruyere-Gradino 08/16/77 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
51 Cremino* 09/27/78 NTS Shaft Weapons Related Less than 20 kt
Cremino-
Caerphilly 09/27/78 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Phalanx
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
52 Branco* 09/21/83 NTS Shaft Weapons Related Less than 20 kt
Branco-Herkimer 09/21/83 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Musketeer
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
53 Hazebrook*-Emerald
(Green) 02/03/87 NTS Shaft Weapons Related Less than 20 kt
Hazebrook-Checkerberry
(Red) 02/03/87 NTS Shaft Weapons Related Less than 20 kt
Hazebrook-Apricot
(Orange) 02/03/87 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Touchstone
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
54 Harlingen*-A 08/23/88 NTS Shaft Weapons Related Less than 20 kt
Harlingen-B 08/23/88 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
Operation Cornerstone
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
55 Monahans*-A 11/09/88 NTS Shaft Weapons Related Less than 20 kt
Monahans-B 11/09/88 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, separate holes
56 Kawich A*-White 12/09/88 NTS Shaft Weapons Related Less than 20 kt
Kawich A-Blue 12/09/88 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
57 Kawich*-Red 02/24/89 NTS Shaft Weapons Related Less than 20 kt
Kawich-Black 02/24/89 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
58 Palisade*-1 05/15/89 NTS Shaft Weapons Related Less than 20 kt
Palisade-2 05/15/89 NTS Shaft Weapons Related Less than 20 kt
Palisade-3 05/15/89 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Aqueduct
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
59 Whiteface*-A 12/20/89 NTS Shaft Weapons Related Less than 20 kt
Whiteface-B 12/20/89 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
60 Mineral Quarry* 07/25/90 NTS Tunnel Weapons Effects Less than 20 kt
Randsburg 07/25/90 NTS Tunnel Weapons Related Less than 20 kt
Simultaneous, separate drifts
DoD event
61 Sundown*-A 09/20/90 NTS Shaft Weapons Related Less than 20 kt
Sundown-B 09/20/90 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Sculpin
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
62 Coso*-Bronze 03/08/91 NTS Shaft Weapons Related Less than 20 kt
Coso-Gray 03/08/91 NTS Shaft Weapons Related Less than 20 kt
Coso-Silver 03/08/91 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Operation Julin
Date Loca-
Test (GCT) tion Type Purpose Yield Range
------------------- --------- ----- ------ ---------------- ---------------
63 Galena*-Yellow 06/23/92 NTS Shaft Weapons Related Less than 20 kt
Galena-Orange 06/23/92 NTS Shaft Weapons Related Less than 20 kt
Galena-Green 06/23/92 NTS Shaft Weapons Related Less than 20 kt
Simultaneous, same hole
Notes
* Event name and date previously announced.
# Application of nuclear explosives to develop peaceful uses for atomic
energy. The program is no longer active.
June 20, 1994
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