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United States Nuclear Tests With Unannounced Simultaneous Detonations -- By Date

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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