diff --git a/tests/regression_tests/lattice_mixed/__init__.py b/tests/regression_tests/lattice_mixed/__init__.py
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/tests/regression_tests/lattice_mixed/geometry.xml b/tests/regression_tests/lattice_mixed/geometry.xml
deleted file mode 100644
index 41aa05d411..0000000000
--- a/tests/regression_tests/lattice_mixed/geometry.xml
+++ /dev/null
@@ -1,156 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!--
-  This geometry approximately describes a Russian-style VVER-1000 fuel assembly.
--->
-
-<geometry>
-  <surface id="001" type="z-plane" coeffs="-10000"/>
-
-  <!-- Universe 011: Fuel pellet -->
-  <surface id="011" type="z-cylinder" coeffs="0.0 0.0 0.06"/>
-  <surface id="012" type="z-cylinder" coeffs="0.0 0.0 0.378"/>
-  <surface id="013" type="z-cylinder" coeffs="0.0 0.0 0.3865"/>
-  <surface id="014" type="z-cylinder" coeffs="0.0 0.0 0.455"/>
-  <surface id="015" type="sphere" coeffs="0.0 0.0 -2.5639 2.0"/>
-  <surface id="016" type="sphere" coeffs="0.0 0.0 2.5639 2.0"/>
-
-  <cell id="011" universe="011" material="void" region="-011"/>
-  <cell id="012" universe="011" material="13" region="011 -012 015 016"/>
-  <cell id="013" universe="011" material="void" region="011 -012 -015"/>
-  <cell id="014" universe="011" material="void" region="011 -012 -016"/>
-  <cell id="015" universe="011" material="void" region="012 -013"/>
-  <cell id="016" universe="011" material="21" region="013 -014"/>
-  <cell id="017" universe="011" material="01" region="014"/>
-
-
-  <!-- Universe 051: Central guide tube -->
-    <surface id="051" type="z-cylinder" coeffs="0.0 0.0 0.44"/>
-    <surface id="052" type="z-cylinder" coeffs="0.0 0.0 0.515"/>
-    <cell id="051" universe="051" material="01" region="-051"/>
-    <cell id="052" universe="051" material="21" region="051 -052"/>
-    <cell id="053" universe="051" material="01" region="052"/>
-
-
-  <!-- Universe 055: Cluster tube -->
-    <surface id="155" type="z-cylinder" coeffs="0.0 0.0 0.55"/>
-    <surface id="156" type="z-cylinder" coeffs="0.0 0.0 0.63"/>
-    <cell id="155" universe="055" material="01" region="-155"/>
-    <cell id="156" universe="055" material="22" region="155 -156"/>
-    <cell id="157" universe="055" material="01" region="156"/>
-
-
-
-
-  <!-- Lattice 101: Fuel assembly pins -->
-  <cell id="100" universe="100" material="01"/>
-  <hex_lattice id="101" outer="100" n_rings="11"
-      center="0.0 0.0" pitch="1.265">
-    <universes>
-                                    011
-                                 011   011
-                              011   011   011
-                           011   011   011   011
-                        011   011   011   011   011
-                     011   011   011   011   011   011
-                  011   011   011   011   011   011   011
-               011   011   011   011   011   011   011   011
-            011   011   011   011   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-      011   011   011   011   011   055   011   011   011   011   011
-         011   011   011   055   011   011   055   011   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   055   011   011   055   011   055   011   011
-      011   011   011   011   055   011   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   011   011   011   011   055   011   011   011
-      011   011   055   011   011   051   011   011   055   011   011
-         011   011   011   055   011   011   011   011   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-      011   011   011   011   011   011   055   011   011   011   011
-         011   011   055   011   055   011   011   055   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-      011   011   011   011   011   011   011   011   011   011   011
-         011   011   011   055   011   011   055   011   011   011
-      011   011   011   011   011   055   011   011   011   011   011
-         011   011   011   011   011   011   011   011   011   011
-            011   011   011   011   011   011   011   011   011
-               011   011   011   011   011   011   011   011
-                  011   011   011   011   011   011   011
-                     011   011   011   011   011   011
-                        011   011   011   011   011
-                           011   011   011   011
-                              011   011   011
-                                 011   011
-                                    011
-    </universes>
-  </hex_lattice>
-
-  <cell id="102" universe="102" fill="101"/>
-
-  <lattice id="103" outer="100" dimension="1 1 294"
-      lower_left="-25.0 -25.0 -177.0"  pitch="50.0 50.0 1.2">
-    <universes>
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102 102 102 102 102 102 102
-      102 102 102 102
-    </universes>
-  </lattice>
-
-
-
-
-  <!-- Universe 0 -->
-  <surface id="1001" type="plane" coeffs="1.0 0.0 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1002" type="plane" coeffs="0.5 0.866 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1003" type="plane" coeffs="-0.5 0.866 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1004" type="plane" coeffs="-1.0 0.0 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1005" type="plane" coeffs="-0.5 -0.866 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1006" type="plane" coeffs="0.5 -0.866 0.0 11.8"
-      boundary="reflective"/>
-  <surface id="1007" type="z-plane" coeffs="-177.4" boundary="vacuum"/>
-  <surface id="1008" type="z-plane" coeffs="177.4" boundary="vacuum"/>
-
-  <cell id="1001" universe="0" fill="103"
-      region="-1001 -1002 -1003 -1004 -1005 -1006 1007 -1008"/>
-
-</geometry>
diff --git a/tests/regression_tests/lattice_mixed/materials.xml b/tests/regression_tests/lattice_mixed/materials.xml
deleted file mode 100644
index c7649fcf9a..0000000000
--- a/tests/regression_tests/lattice_mixed/materials.xml
+++ /dev/null
@@ -1,42 +0,0 @@
-<?xml version="1.0"?>
-<materials>
-
-  <!-- Material 01: Water -->
-  <material id="01">
-    <density value="0.998" units="g/cc"/>
-    <nuclide name="H1"  ao="2.0"/>
-    <nuclide name="O16" ao="1.0"/>
-    <nuclide name="B10" ao="0.00085"/>
-  </material>
-
-  <!-- Material 13: Fuel (3.30%) -->
-  <material id="13">
-    <density value="10.371" units="g/cc"/>
-    <nuclide name="U235" ao="0.033408078"/>
-    <nuclide name="U238" ao="0.966591922"/>
-    <nuclide name="O16"  ao="2.0"/>
-  </material>
-
-  <!-- Material 21: Zircaloy -->
-  <material id="21">
-    <density value="6.44" units="g/cc" />
-    <nuclide name="Zr90"  wo="0.501807"/>
-    <nuclide name="Zr91"  wo="0.110712"/>
-    <nuclide name="Zr92"  wo="0.170991"/>
-    <nuclide name="Zr94"  wo="0.177057"/>
-    <nuclide name="Zr96"  wo="0.029133"/>
-  </material>
-
-  <!-- Material 22: Steel -->
-  <material id="22">
-    <density value="7.9" units="g/cc"/>
-    <nuclide name="Mn55" wo="2"/>
-    <nuclide name="Ni58" wo="6.83"/>
-    <nuclide name="Ni60" wo="2.61"/>
-    <nuclide name="Cr53" wo="1.71"/>
-    <nuclide name="Fe54" wo="3.98257"/>
-    <nuclide name="Fe56" wo="63.03447"/>
-    <nuclide name="Fe57" wo="1.4763"/>
-  </material>
-
-</materials>
diff --git a/tests/regression_tests/lattice_mixed/plots.xml b/tests/regression_tests/lattice_mixed/plots.xml
deleted file mode 100644
index 903d69aef2..0000000000
--- a/tests/regression_tests/lattice_mixed/plots.xml
+++ /dev/null
@@ -1,32 +0,0 @@
-<?xml version="1.0"?>
-<plots>
-
-  <plot id="1" type="slice" basis="xy" color_by="cell">
-    <filename>xy_cell</filename>
-    <origin>0 0 0</origin>
-    <width>30 30</width>
-    <pixels>500 500</pixels>
-  </plot>
-
-  <plot id="2" type="slice" basis="xy" color_by="material">
-    <filename>xy_material</filename>
-    <origin>0 0 0</origin>
-    <width>30 30</width>
-    <pixels>500 500</pixels>
-  </plot>
-
-  <plot id="3" type="slice" basis="yz" color_by="cell">
-    <filename>yz_cell</filename>
-    <origin>0 0 0</origin>
-    <width>50 400</width>
-    <pixels>500 4000</pixels>
-  </plot>
-
-  <plot id="4" type="slice" basis="yz" color_by="material">
-    <filename>yz_material</filename>
-    <origin>0 0 0</origin>
-    <width>5 5</width>
-    <pixels>500 500</pixels>
-  </plot>
-
-</plots>
diff --git a/tests/regression_tests/lattice_mixed/results_true.dat b/tests/regression_tests/lattice_mixed/results_true.dat
deleted file mode 100644
index 09af26768b..0000000000
--- a/tests/regression_tests/lattice_mixed/results_true.dat
+++ /dev/null
@@ -1,2 +0,0 @@
-k-combined:
-9.877395E-01 1.744626E-02
diff --git a/tests/regression_tests/lattice_mixed/settings.xml b/tests/regression_tests/lattice_mixed/settings.xml
deleted file mode 100644
index 69d50204e0..0000000000
--- a/tests/regression_tests/lattice_mixed/settings.xml
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<settings>
-  <run_mode>eigenvalue</run_mode>
-  <batches>10</batches>
-  <inactive>5</inactive>
-  <particles>500</particles>
-
-  <source>
-    <space type="box">
-      <parameters>-8.0 -8.0 -176
-                  8.0 8.0 176</parameters>
-    </space>
-  </source>
-</settings>
diff --git a/tests/regression_tests/lattice_mixed/test.py b/tests/regression_tests/lattice_mixed/test.py
deleted file mode 100644
index 3df1d7a4f3..0000000000
--- a/tests/regression_tests/lattice_mixed/test.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from tests.testing_harness import TestHarness
-
-
-def test_lattice_mixed():
-    harness = TestHarness('statepoint.10.h5')
-    harness.main()